digital clock / calendar / thermometer

Here is a finely made digital clock with calendar and thermometer.

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.

The project site can also be found and the project: a digital thermostat. READ MORE...

Connect The Thermal Printer to Microcontroller

This is how to actually only the head of thermal printer and the printer does not complete. Management of the whole printer would be much easier, just send a couple of AT commands and it starts to print the desired information. In this case, the author had to make a "font" in the firmware, to control two servo motors and warming elements on the print head.

Connect The Thermal Printer to Microcontroller

Microcontroller that is used with the Atmel AVR Arduino bootloader-om. Warming elements are controlled with a ULN2801A Darlington transistors that are again controlled by SN74164 shift register to preserve a lot of IO pins. See the video printer in action.

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