Tiny RTC -DS1307 DS18B20 Real time clock Module – PIC AVR ARM BRAND NEW UK STOCK



The Tiny RTC real time clock breakout board provides a Maximum DS1307 Real Time Clock Maxim DS1307 Real Time Clock and a Atmel 24C32 EEPROM Atmel 24C32 EEPROM.

You can also optionally choose to have (supplied loose for you to solder)
DS18B20 Temperature sensor (option With DS18B20? yes)
Straight pins (option With SIL headers? yes)
Right angle pins (option With SIL headers? yes right angled)

Please note the battery IS NOT Included.
You can fit a LIR2032 rechargable battery to the module.
If you decide to fit a non rechargable battery e.g. CR2032 you MUST remove the charging circuit from the module by remove components R5, D1, R4 R6 and replace R6 with a link. THIS IS VERY IMPORTANT AS YOU MUST NOT CHARGE A NON RECHARGABLE BATTERY.

eBAY no longer allow on the listing any external links to the circuit diagram for fitting correct battery: Circuit Diagram. So i have explained what needs to be done above if you decide to fit a non-rechargable battery. No components need to be removed if you use a LIR2032 rechargable battery.
If you are unsure please do not order.

If you require just the DS1307 chip with no accompanying circuitry, please see our other item: DS1307 Real Time Clock chip.

Each and every product is tested on my purpose built jig, so it will arrive in full working order.


Pins that are on connectors P1 and P2 with the same name are linked.

Connector Pin Function
P1 SQ DS1307 output
(User Selectable setting the SQWE, RS0 and RS1 Bit Registers)
P1 DS 1-WIRE bus data line
P1 SCL I2C clock
P1 SDA I2C data
P1 VCC +5V power
P1 GND Ground
P1 BAT Positive battery terminal
P2 DS 1-WIRE bus data line
P2 SCL I2C clock
P2 SDA I2C data
P2 VCC +5V power
P2 GND Ground


Please read and note the following before ordering:
1) My Shipping is for UK Mainland ONLY. No Scotish Highland, Northern Ireland, Isle of Wight or other Isles. Some areas may incur additional costs, if you are unsure please contact me prior to ordering.
2) Please ensure you have a valid contact phone number, I may pass this number onto the Carrier for delivery. No refund for carriage cost will be offered, if delivery is delayed as a result of no valid contact number being provided.
3) I welcome collection for orders,please select collection on checkout otherwise your order will be despatched. Once your order has been picked and tested if applicable. We will then inform you of a date and time for collection. Please bring your payment card for verification when collecting your order. No order will be released without card verification.
4) I am unable to provide ANY technical support, please ensure you fully understand how this item works by checking for any datasheets (not provided with the item), to enable the product to be used within your application / project.
5) VERY IMPORTANT >> Do not make ANY permanent connections. Please test the item BEFORE making any permanent connections e.g. soldering to the item. Please ensure you have the means to test the item WITHOUT applying ANY solder to the item. If an item has any solder applied I will NOT accept any return.
6) When upgrading to 1st class post, (if the option is available), please note this is sent via Royal Mail and is not a guaranteed next day service. If you need a 48hr service please select 48hr delivery at extra cost. This will be sent via Royal Mail or courier. I do not offer a 24hr service. No weekend or public bank holiday deliveries.
7) We attempt to send out all orders received before 10.00am. This excludes weekends and public holidays.
8) Customers placing multiple orders. – I may ship all the orders as one, please do not ask for a refund of shipping cost after you have placed your orders. Please do not place your orders if you want a refund of shipping cost.
9) Some items may have a “Warranty Void if removed” sticker, please DO NOT tamper or remove these stickers. I will not accept any rertuns with tampered or removed sticker. Some buyers have tried to send back items that I have not supplied.

**** Important note **** Some sellers claim the stock is in the UK, please be careful, the seller is often in China and sends the item to a UK agent who then forwards the item on with a UK stamp. Check where the seller is located not just the item location. All my items are physically with me, here in the UK and I offer a quick delivery and communication within the UK. During busy periods there maybe a delay in delivering your package by Royal Mail. I apologies in adavnce for any inconvenience but would like to point this out before you place your order.