Here is a finely made digital clock with calendar and thermometer.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicjMmPLM9o8n2FcT_IQ0qeXW0B48yDfuDhlIpslpj_HNgv2_dcigSyghuucEMNBB-w45K4G7imiLQrHOz6IQBd899YgZ3CHs2NPObNEb61fM7GMQL1MBCbZtTk8FmmKMjBtmv_lKf9zSK8/s400/Here+is+a+finely+made+digital+clock+with+calendar+and+thermometer..jpg)
It is based on Microchip PIC16F628 (or PIC16F84) microcontroller and DS18S20 or DS18B20 temperature sensor from Maxim-IC. The hardware is pretty easy because it contains only a PIC microcontroller, DS18S20/DS18B20 sensor, 4x7 segment LED display with common anode, four 2N3906 transistors and several resistors.
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