Simplest Temperature Data Logger based on PIC12F683
This one chip data logger uses PIC12F683 microcontroller to read temperature from a DS1820 sensor and store it inside its internal EEPROM memory. The process is repeated in every 1 sec, 1 min, or 10 min interval as selected by user. The stored values can be transferred to a host PC through serial port. The serial communication uses a transistor based TTL to RS232 Level converter circuit to transfer data to PC.
This logger can store up to 254 temperature measurements in its internal EEPROM. Each data is 8-bit and the temperature resolution is 1 degree C. With three tact switch inputs, the user can control Start, Stop, Send, Reset, and Sampling time set operations. The hardware and firmware is available for free.