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3x4 Matrix Keypad for Micro Controller. Robust plastic, hard keys, fits Arduino etc.
This black keypad with white letters comes with 12 tactile switches. The resistance of a pressed key element is <1k Ohm. An operation voltage of 35V and a maximum current of 10mA per switch element must not be exceeded.
A library, supporting this Matrix Keypad, is available for example within the Arduino IDE.
Dimensions: 51.5 x 69mm
2 reviews for 3x4 Matrix Keypad, hard keys, black
Rated 5 out of 5
Marc –
i have spend time to find the lines.. on Arduino-Uno, i use D0 to D7 (shift to D3 to D9 if you use the serial terminal because D0-D1 are the communication lines and the keypad will be jammed) directly on the connector and so, the keypad is on the Arduino, not in the air.. (don’t use/solder the first and the last hole of the KeyPad).. for to be compatible with the keypad library, write those code lines:byte ROWS = 4;byte COLS = 3;byte rowPins[ROWS] = ;byte colPins[COLS] = ;char hexaKeys[ROWS][COLS] = };with those code lines, all work fine!to have the decimal (0-9) value, use this line:decimal_number = customKey – 48;
Rated 4 out of 5
Robert Leedham (verified owner)–
A heads up – the pads are not on 0.1″ spacing; can’t use on a breadboard.
Seems OK otherwise.
Only logged in customers who have purchased this product may leave a review.
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var PayPalCommerceGateway = {"url":"https://www.paypal.com/sdk/js?client-id=BAAVwOOBwAshKbZYngRagbITamdh5azmNPzdkCKAO002JWyKNFlmpK4QYkiyKOoW1RR0ibwp-EwtFzjBPY¤cy=CAD&integration-date=2026-03-04&components=buttons,funding-eligibility,messages&vault=true&commit=false&intent=capture&debug=1&disable-funding=card&enable-funding=venmo,paylater","url_params":{"client-id":"BAAVwOOBwAshKbZYngRagbITamdh5azmNPzdkCKAO002JWyKNFlmpK4QYkiyKOoW1RR0ibwp-EwtFzjBPY","currency":"CAD","integration-date":"2026-03-04","components":"buttons,funding-eligibility,messages","vault":"true","commit":"false","intent":"capture","debug":true,"disable-funding":"bancontact,blik,eps,ideal,mybank,p24,trustly,multibanco,card","enable-funding":"venmo,paylater"},"script_attributes":{"data-partner-attribution-id":"Woo_PPCP","data-page-type":"product-details"},"client_id":"BAAVwOOBwAshKbZYngRagbITamdh5azmNPzdkCKAO002JWyKNFlmpK4QYkiyKOoW1RR0ibwp-EwtFzjBPY","currency":"CAD","data_client_id":{"set_attribute":true,"endpoint":"/?wc-ajax=ppc-data-client-id","nonce":"163b1e55c8","user":0,"has_subscriptions":false,"paypal_subscriptions_enabled":false},"redirect":"https://www.universal-solder.ca/checkout/","context":"product","ajax":{"simulate_cart":{"endpoint":"/?wc-ajax=ppc-simulate-cart","nonce":"90d82671e6"},"change_cart":{"endpoint":"/?wc-ajax=ppc-change-cart","nonce":"2dcd0f24c0"},"create_order":{"endpoint":"/?wc-ajax=ppc-create-order","nonce":"bbe66991c4"},"approve_order":{"endpoint":"/?wc-ajax=ppc-approve-order","nonce":"c6b8679f11"},"get_order":{"endpoint":"/?wc-ajax=ppc-get-order","nonce":"31134039ed"},"approve_subscription":{"endpoint":"/?wc-ajax=ppc-approve-subscription","nonce":"17de6ecfe3"},"vault_paypal":{"endpoint":"/?wc-ajax=ppc-vault-paypal","nonce":"9433b06f33"},"save_checkout_form":{"endpoint":"/?wc-ajax=ppc-save-checkout-form","nonce":"f6dc2cfab0"},"validate_checkout":{"endpoint":"/?wc-ajax=ppc-validate-checkout","nonce":"4736c49508"},"cart_script_params":{"endpoint":"/?wc-ajax=ppc-cart-script-params"},"create_setup_token":{"endpoint":"/?wc-ajax=ppc-create-setup-token","nonce":"5fa7d50bb0"},"create_payment_token":{"endpoint":"/?wc-ajax=ppc-create-payment-token","nonce":"ab26f52a2b"},"create_payment_token_for_guest":{"endpoint":"/?wc-ajax=ppc-update-customer-id","nonce":"74a9e577dc"},"update_shipping":{"endpoint":"/?wc-ajax=ppc-update-shipping","nonce":"302d5f31b2"},"update_customer_shipping":{"shipping_options":{"endpoint":"https://www.universal-solder.ca/wp-json/wc/store/v1/cart/select-shipping-rate"},"shipping_address":{"cart_endpoint":"https://www.universal-solder.ca/wp-json/wc/store/v1/cart/","update_customer_endpoint":"https://www.universal-solder.ca/wp-json/wc/store/v1/cart/update-customer"},"wp_rest_nonce":"3c08b80f5a","update_shipping_method":"/?wc-ajax=update_shipping_method"}},"cart_contains_subscription":"","subscription_plan_id":"","vault_v3_enabled":"1","variable_paypal_subscription_variations":[],"variable_paypal_subscription_variation_from_cart":"","subscription_product_allowed":"","locations_with_subscription_product":{"product":false,"payorder":false,"cart":false},"enforce_vault":"","can_save_vault_token":"1","is_free_trial_cart":"","bn_codes":{"checkout":"Woo_PPCP","cart":"Woo_PPCP","mini-cart":"Woo_PPCP","product":"Woo_PPCP"},"payer":null,"button":{"wrapper":"#ppc-button-ppcp-gateway","is_disabled":false,"mini_cart_wrapper":"#ppc-button-minicart","is_mini_cart_disabled":false,"cancel_wrapper":"#ppcp-cancel","mini_cart_style":{"layout":"vertical","color":"gold","shape":"rect","label":"pay","tagline":false,"height":35},"style":{"layout":"vertical","color":"gold","shape":"rect","label":"pay","tagline":false}},"separate_buttons":{"card":{"id":"ppcp-card-button-gateway","wrapper":"#ppc-button-ppcp-card-button-gateway","style":{"shape":"rect","color":"black","layout":"horizontal"}}},"hosted_fields":{"wrapper":"#ppcp-hosted-fields","labels":{"credit_card_number":"","cvv":"","mm_yy":"MM/YY","fields_empty":"Card payment details are missing. Please fill in all required fields.","fields_not_valid":"Unfortunately, your credit card details are not valid.","card_not_supported":"Unfortunately, we do not support your credit card.","cardholder_name_required":"Cardholder's first and last name are required, please fill the checkout form required fields."},"valid_cards":["mastercard","visa","amex","jcb","american-express","master-card"],"contingency":"NO_3D_SECURE"},"messages":{"wrapper":".ppcp-messages","is_hidden":false,"block":{"enabled":false},"amount":4.51,"placement":"product","style":{"layout":"text","logo":{"type":"inline","position":"left"},"text":{"color":"black","size":"12"},"color":"blue","ratio":"1x1"}},"labels":{"error":{"generic":"Something went wrong. Please try again or choose another payment source.","required":{"generic":"Required form fields are not filled.","field":"%s is a required field.","elements":{"terms":"Please read and accept the terms and conditions to proceed with your order."}}},"billing_field":"Billing %s","shipping_field":"Shipping %s"},"simulate_cart":{"enabled":true,"throttling":5000},"order_id":"0","order_key":"","single_product_buttons_enabled":"1","mini_cart_buttons_enabled":"","basic_checkout_validation_enabled":"","early_checkout_validation_enabled":"1","funding_sources_without_redirect":["paypal","paylater","venmo","card"],"user":{"is_logged":false,"has_wc_card_payment_tokens":false},"should_handle_shipping_in_paypal":"","server_side_shipping_callback":{"enabled":true},"appswitch":{"enabled":true},"needShipping":"","vaultingEnabled":"1","productType":"simple","manualRenewalEnabled":"","final_review_enabled":"1"};
//# sourceURL=ppcp-smart-button-js-extra
var woosb_vars = {"wc_price_decimals":"2","wc_price_format":"%1$s%2$s","wc_price_thousand_separator":",","wc_price_decimal_separator":".","wc_currency_symbol":"C$","price_decimals":"2","price_format":"%1$s%2$s","price_thousand_separator":",","price_decimal_separator":".","currency_symbol":"C$","trim_zeros":"","round_price":"1","recalc_price":"","change_image":"no","bundled_price":"no","bundled_price_from":"regular_price","change_price":"no","price_selector":".summary \u003E .price","saved_text":"(saved [d])","price_text":"Bundle price:","selected_text":"Selected:","alert_selection":"Please select a purchasable variation for [name] before adding this bundle to the cart.","alert_unpurchasable":"Product [name] is unpurchasable. Please remove it before adding the bundle to the cart.","alert_empty":"Please choose at least one product before adding this bundle to the cart.","alert_min":"Please choose at least a total quantity of [min] products before adding this bundle to the cart.","alert_max":"Sorry, you can only choose at max a total quantity of [max] products before adding this bundle to the cart.","alert_total_min":"The total must meet the minimum amount of [min].","alert_total_max":"The total must meet the maximum amount of [max]."};
//# sourceURL=woosb-frontend-js-extra
var wc_stripe_express_checkout_params = {"ajax_url":"/?wc-ajax=%%endpoint%%","stripe":{"publishable_key":"pk_live_51AEsYaBTl86KSn0dsYsBLiLLHfIJsseIwYJcASWjNBykJtepfeJcb19VnL373p9cfdGx7YIemObwDNHcX2uSZyYF00Z2wUv5Oc","allow_prepaid_card":"yes","locale":"en","is_link_enabled":false,"is_express_checkout_enabled":true,"is_amazon_pay_enabled":false,"is_payment_request_enabled":true},"nonce":{"payment":"271114028a","shipping":"eee1185092","normalize_address":"ad2ecf96ec","get_cart_details":"86ccd9f8d3","update_shipping":"959c3edcc0","checkout":"8a924e376d","add_to_cart":"634dc6ea17","get_selected_product_data":"6869bca255","log_errors":"2780132b36","clear_cart":"83e28f7ffa","pay_for_order":"6735dcb826","wc_store_api":"3c08b80f5a","wc_store_api_express_checkout":"30cd60e8cd"},"i18n":{"no_prepaid_card":"Sorry, we're not accepting prepaid cards at this time.","unknown_shipping":"Unknown shipping option \"[option]\"."},"checkout":{"url":"https://www.universal-solder.ca/checkout/","currency_code":"cad","currency_decimals":2,"country_code":"CA","needs_shipping":"no","needs_payer_phone":true,"default_shipping_option":{"id":"pending","displayName":"Pending","amount":0}},"button":{"type":"default","theme":"dark","height":"48","radius":"4","locale":"en"},"is_pay_for_order":"","has_block":"","login_confirmation":"","is_product_page":"1","is_checkout_page":"","product":{"shippingOptions":[{"id":"pending","displayName":"Pending","amount":0}],"displayItems":[{"label":"3x4 Matrix Keypad, hard keys, black","amount":399},{"label":"Tax","amount":0,"pending":false},{"label":"Tax","amount":52,"pending":false},{"label":"Shipping","amount":0,"pending":true}],"total":{"label":" (via WooCommerce)","amount":451,"pending":true},"requestShipping":true,"currency":"cad","country_code":"CA","validVariationSelected":true},"is_cart_page":"","taxes_based_on_billing":"","allowed_shipping_countries":["AU","AT","BE","BG","CA","CR","CZ","DK","FI","FR","DE","GR","GL","GG","HU","IS","IE","IT","LI","LT","LU","NL","NZ","NO","PT","PR","SK","ES","SE","CH","GB","US","UM"],"custom_checkout_fields":[],"has_free_trial":""};
//# sourceURL=wc_stripe_express_checkout-js-extra
var wc_address_i18n_params = {"locale":"{\"AT\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"AU\":{\"city\":[],\"postcode\":[],\"state\":[]},\"BE\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"BG\":{\"state\":{\"required\":false}},\"CA\":{\"postcode\":[],\"state\":[]},\"CH\":{\"postcode\":[],\"state\":{\"required\":false}},\"CR\":{\"state\":[]},\"CZ\":{\"state\":{\"required\":false,\"hidden\":true}},\"DE\":{\"postcode\":[],\"state\":{\"required\":false}},\"DK\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"FI\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"FR\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"GG\":{\"state\":{\"required\":false}},\"GR\":{\"state\":{\"required\":false}},\"HU\":{\"last_name\":[],\"first_name\":[],\"postcode\":[],\"city\":[],\"address_1\":[],\"address_2\":[],\"state\":{\"required\":false}},\"IE\":{\"postcode\":{\"required\":true},\"state\":[]},\"IS\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"IT\":{\"postcode\":[],\"state\":{\"required\":true}},\"NL\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"NZ\":{\"postcode\":[],\"state\":{\"required\":false}},\"NO\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"PR\":{\"city\":[],\"state\":{\"required\":false,\"hidden\":true}},\"PT\":{\"state\":{\"required\":false,\"hidden\":true}},\"SK\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"ES\":{\"postcode\":[],\"state\":[]},\"LI\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"LU\":{\"state\":{\"required\":false,\"hidden\":true}},\"SE\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"US\":{\"postcode\":[],\"state\":[]},\"GB\":{\"postcode\":[],\"state\":{\"required\":false}},\"default\":{\"first_name\":{\"required\":true,\"autocomplete\":\"given-name\"},\"last_name\":{\"required\":true,\"autocomplete\":\"family-name\"},\"company\":{\"autocomplete\":\"organization\",\"required\":false},\"country\":{\"type\":\"country\",\"required\":true,\"autocomplete\":\"country\"},\"address_1\":{\"required\":true,\"autocomplete\":\"address-line1\",\"description\":\"House number and street name\"},\"address_2\":{\"label_class\":[],\"autocomplete\":\"address-line2\",\"required\":false,\"description\":\"Apartment, unit, building, floor, etc.\"},\"city\":{\"required\":true,\"autocomplete\":\"address-level2\"},\"state\":{\"type\":\"state\",\"required\":true,\"validate\":[\"state\"],\"autocomplete\":\"address-level1\"},\"postcode\":{\"required\":true,\"validate\":[\"postcode\"],\"autocomplete\":\"postal-code\"}}}","locale_fields":"{\"address_1\":\"#billing_address_1_field, #shipping_address_1_field\",\"address_2\":\"#billing_address_2_field, #shipping_address_2_field\",\"state\":\"#billing_state_field, #shipping_state_field, #calc_shipping_state_field\",\"postcode\":\"#billing_postcode_field, #shipping_postcode_field, #calc_shipping_postcode_field\",\"city\":\"#billing_city_field, #shipping_city_field, #calc_shipping_city_field\"}","i18n_required_text":"required","i18n_optional_text":"optional"};
//# sourceURL=wc-address-i18n-js-extra
var wc_checkout_params = {"ajax_url":"/wp-admin/admin-ajax.php","wc_ajax_url":"/?wc-ajax=%%endpoint%%","update_order_review_nonce":"abc01ad4d6","apply_coupon_nonce":"57b8b7f874","remove_coupon_nonce":"ad2aca9b06","option_guest_checkout":"yes","checkout_url":"/?wc-ajax=checkout","is_checkout":"0","debug_mode":"1","i18n_checkout_error":"There was an error processing your order. Please check for any charges in your payment method and review your \u003Ca href=\"https://www.universal-solder.ca/my-account/orders/\"\u003Eorder history\u003C/a\u003E before placing the order again.","gateways_with_custom_place_order_button":[]};
//# sourceURL=wc-checkout-js-extra
var wc_stripe_upe_params = {"gatewayId":"stripe","title":"Credit / Debit Card","isUPEEnabled":"1","key":"pk_live_51AEsYaBTl86KSn0dsYsBLiLLHfIJsseIwYJcASWjNBykJtepfeJcb19VnL373p9cfdGx7YIemObwDNHcX2uSZyYF00Z2wUv5Oc","locale":"en","apiVersion":"2024-06-20","isLoggedIn":"","isSignupOnCheckoutAllowed":"1","isCheckout":"","return_url":"https://www.universal-solder.ca/checkout/order-received/?utm_nooverride=1","ajax_url":"/?wc-ajax=%%endpoint%%","wp_ajax_url":"https://www.universal-solder.ca/wp-admin/admin-ajax.php","theme_name":"astra","testMode":"","createPaymentIntentNonce":"1e797a295c","updatePaymentIntentNonce":"3b266207a8","createSetupIntentNonce":"5222c1f33f","createAndConfirmSetupIntentNonce":"07e97f6d1c","updateFailedOrderNonce":"ec4c3c30dc","createCheckoutSessionNonce":"d78980c476","paymentMethodsConfig":{"card":{"isReusable":true,"title":"Credit / Debit Card","description":"","testingInstructions":"\u003Cstrong\u003ETest mode:\u003C/strong\u003E use the test VISA card 4242424242424242 with any expiry date and CVC. Other payment methods may redirect to a Stripe test page to authorize payment. More test card numbers are listed \u003Ca href=\"https://docs.stripe.com/testing\" target=\"_blank\"\u003Ehere\u003C/a\u003E.","showSaveOption":true,"supportsDeferredIntent":true,"countries":[],"enabledPaymentMethods":["card"]}},"genericErrorMessage":"There was a problem processing the payment. Please check your email inbox and refresh the page to try again.","accountDescriptor":"","addPaymentReturnURL":"https://www.universal-solder.ca/my-account/payment-methods/","orderReceivedURL":"https://www.universal-solder.ca/checkout/order-received/","enabledBillingFields":["billing_email","billing_first_name","billing_last_name","billing_phone","billing_company","billing_country","billing_address_1","billing_address_2","billing_city","billing_state","billing_postcode"],"cartContainsSubscription":"","subscriptionRequiresManualRenewal":"","subscriptionManualRenewalEnabled":"","forceSavePaymentMethod":"","accountCountry":"CA","isExpressCheckoutEnabled":"1","isAmazonPayEnabled":"","isLinkEnabled":"","appearance":{"theme":"stripe"},"blocksAppearance":{"theme":"stripe"},"saveAppearanceNonce":"a56949d96f","isAmazonPayAvailable":"1","isOCEnabled":"","hasAffirmGatewayPlugin":"","hasKlarnaGatewayPlugin":"","cartTotal":"0","currency":"CAD","isPaymentNeeded":"","invalid_number":"The card number is not a valid credit card number.","invalid_expiry_month":"The card's expiration month is invalid.","invalid_expiry_year":"The card's expiration year is invalid.","invalid_cvc":"The card's security code is invalid.","incorrect_number":"The card number is incorrect.","incomplete_number":"The card number is incomplete.","incomplete_cvc":"The card's security code is incomplete.","incomplete_expiry":"The card's expiration date is incomplete.","expired_card":"The card has expired.","incorrect_cvc":"The card's security code is incorrect.","incorrect_zip":"The card's zip code failed validation.","postal_code_invalid":"Invalid zip code, please correct and try again","invalid_expiry_year_past":"The card's expiration year is in the past","card_declined":"The card was declined.","missing":"There is no card on a customer that is being charged.","processing_error":"An error occurred while processing the card.","invalid_sofort_country":"The billing country is not accepted by Sofort. Please try another country.","email_invalid":"Invalid email address, please correct and try again.","invalid_request_error":"Unable to process this payment, please try again or use alternative method.","amount_too_large":"The order total is too high for this payment method","amount_too_small":"The order total is too low for this payment method","country_code_invalid":"Invalid country code, please try again with a valid country code","tax_id_invalid":"Invalid Tax Id, please try again with a valid tax id","invalid_wallet_type":"Invalid wallet payment type, please try again or use an alternative method.","payment_intent_authentication_failure":"We are unable to authenticate your payment method. Please choose a different payment method and try again.","insufficient_funds":"Your card has insufficient funds."};
//# sourceURL=wc-stripe-upe-classic-js-extra
var wc_add_to_cart_variation_params = {"wc_ajax_url":"/?wc-ajax=%%endpoint%%","i18n_no_matching_variations_text":"Sorry, no products matched your selection. Please choose a different combination.","i18n_make_a_selection_text":"Please select some product options before adding this product to your cart.","i18n_unavailable_text":"Sorry, this product is unavailable. Please choose a different combination.","i18n_reset_alert_text":"Your selection has been reset. Please select some product options before adding this product to your cart."};
//# sourceURL=wc-add-to-cart-variation-js-extra
Marc –
i have spend time to find the lines.. on Arduino-Uno, i use D0 to D7 (shift to D3 to D9 if you use the serial terminal because D0-D1 are the communication lines and the keypad will be jammed) directly on the connector and so, the keypad is on the Arduino, not in the air.. (don’t use/solder the first and the last hole of the KeyPad).. for to be compatible with the keypad library, write those code lines:byte ROWS = 4;byte COLS = 3;byte rowPins[ROWS] = ;byte colPins[COLS] = ;char hexaKeys[ROWS][COLS] = };with those code lines, all work fine!to have the decimal (0-9) value, use this line:decimal_number = customKey – 48;
Robert Leedham (verified owner) –
A heads up – the pads are not on 0.1″ spacing; can’t use on a breadboard.
Seems OK otherwise.