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The DS3231 RTC Module (Real-Time Clock) is a low-cost, highly accurate device that provides time and date information to a microcontroller or microprocessor. It features a 32 kB memory and an I2C interface, which makes it easy to communicate with other devices in a system. The RTC maintains accurate time even when the power supply is turned off, as it is equipped with a backup battery. The DS3231 can be used in a variety of applications, such as time and date stamping, timed events, and time-based alarms. With its accuracy, memory size, and simple I2C interface, it is a popular choice for many electronics projects.
The DS3231 RTC module has a socket for a rechargeable lithium cell LR2032 and a simple charging circuit.
Since the current drawn from the battery is very tiny, and a standard CR2032 cell will last way over 5 years, it does not make much sense to invest in one of the very expensive, rechargeable cells. If you want to use a standard CR2032 lithium cell, you only need to interrupt the charging circuit by removing one component. Please see the picture gallery for details.
2-wire connection SDA/SCL
Operating voltage 3.3V - 5.5V DC
Multiple libraries (from different authors) are available
4 reviews for DS3231 RTC Module with 32kB Memory, I2C, Battery Backup
Rated 5 out of 5
Marc –
I have done a comparison with the web site timeanddate (a web reference for precision of time).. my rtc have drifted of 1 second in one month.. so, 1 min for more than 6 yrs is more than enough at this price.. cr2032 installed and diode removed, working all time and keep the beat when power is missing.
Rated 5 out of 5
Alan –
Great value. You get a highly accurate real time clock, assess to 32Kb (4Kx8) of EEPROM memory, I2C (2-wire communication with module), battery backup and you can also read the temperature of the DS3231 chip.
I used the real time clock with an arduino project for a 7 day timer with multiple unique timings per day. After running the timer for a week it’s time stayed right on (to the second) with an accurate digital chronometer I compared it with. Good quality device, accurate timing, what more could anyone want.
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=2026-02-05&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":"2026-02-05","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":"14fba31d7a","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":"be1dbf461d"},"change_cart":{"endpoint":"/?wc-ajax=ppc-change-cart","nonce":"bfcb7e8b1e"},"create_order":{"endpoint":"/?wc-ajax=ppc-create-order","nonce":"ebdda2bc04"},"approve_order":{"endpoint":"/?wc-ajax=ppc-approve-order","nonce":"263d669a6d"},"get_order":{"endpoint":"/?wc-ajax=ppc-get-order","nonce":"a341e46421"},"approve_subscription":{"endpoint":"/?wc-ajax=ppc-approve-subscription","nonce":"216c7017ae"},"vault_paypal":{"endpoint":"/?wc-ajax=ppc-vault-paypal","nonce":"e045569efa"},"save_checkout_form":{"endpoint":"/?wc-ajax=ppc-save-checkout-form","nonce":"67c17a8f82"},"validate_checkout":{"endpoint":"/?wc-ajax=ppc-validate-checkout","nonce":"8c49f9229a"},"cart_script_params":{"endpoint":"/?wc-ajax=ppc-cart-script-params"},"create_setup_token":{"endpoint":"/?wc-ajax=ppc-create-setup-token","nonce":"e24a8cfdb8"},"create_payment_token":{"endpoint":"/?wc-ajax=ppc-create-payment-token","nonce":"657a041b8e"},"create_payment_token_for_guest":{"endpoint":"/?wc-ajax=ppc-update-customer-id","nonce":"318ec2acd6"},"update_shipping":{"endpoint":"/?wc-ajax=ppc-update-shipping","nonce":"5b75ce3674"},"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":"293a48969e","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_address_i18n_params = {"locale":"{\"AT\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"AU\":{\"city\":[],\"postcode\":[],\"state\":[]},\"BA\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"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}},\"EE\":{\"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}},\"JP\":{\"last_name\":[],\"first_name\":[],\"postcode\":[],\"state\":[],\"city\":[],\"address_1\":[],\"address_2\":[]},\"LV\":{\"state\":{\"required\":false}},\"NL\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"NZ\":{\"postcode\":[],\"state\":{\"required\":false}},\"NO\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"PL\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"PR\":{\"city\":[],\"state\":{\"required\":false,\"hidden\":true}},\"PT\":{\"state\":{\"required\":false,\"hidden\":true}},\"RO\":{\"state\":{\"required\":true}},\"RS\":{\"city\":{\"required\":true},\"postcode\":{\"required\":true},\"state\":{\"required\":false}},\"SK\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"SI\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"ES\":{\"postcode\":[],\"state\":[]},\"LI\":{\"postcode\":[],\"state\":{\"required\":false,\"hidden\":true}},\"LU\":{\"state\":{\"required\":false,\"hidden\":true}},\"MD\":{\"state\":[]},\"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":"0a1192f5d3","apply_coupon_nonce":"c2e9bf4bf7","remove_coupon_nonce":"0865951071","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."};
//# 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":"8277b02010","updatePaymentIntentNonce":"8568e0fc5a","createSetupIntentNonce":"c4b9b6708b","createAndConfirmSetupIntentNonce":"156173b783","updateFailedOrderNonce":"03fea07098","createCheckoutSessionNonce":"96c9ee35ce","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":"","isAmazonPayEnabled":"","isLinkEnabled":"","appearance":{"theme":"stripe"},"blocksAppearance":{"theme":"stripe"},"saveAppearanceNonce":"e6d4ba96d7","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 done a comparison with the web site timeanddate (a web reference for precision of time).. my rtc have drifted of 1 second in one month.. so, 1 min for more than 6 yrs is more than enough at this price.. cr2032 installed and diode removed, working all time and keep the beat when power is missing.
Alan –
Great value. You get a highly accurate real time clock, assess to 32Kb (4Kx8) of EEPROM memory, I2C (2-wire communication with module), battery backup and you can also read the temperature of the DS3231 chip.
shaun.lovell (verified owner) –
Great tutorial at https://lastminuteengineers.com/ds3231-rtc-arduino-tutorial/
Allan Bowman –
I used the real time clock with an arduino project for a 7 day timer with multiple unique timings per day. After running the timer for a week it’s time stayed right on (to the second) with an accurate digital chronometer I compared it with. Good quality device, accurate timing, what more could anyone want.