Microcontroller | Electronic Project Circuits

Posts Tagged ‘Microcontroller’

Bench Power Supply by PIC16F870

This unit delivers 0 to 20 volts at up to 4 amps in 0.1 volt increments. The entire device runs on a PIC16F870 (about $3 in small quantities). This is basically a switching power supply with the voltage regulation done in software. The PIC used here has analog inputs (used to measure voltage and current) and hardware PWM (pulse width modulation) output used to control the power.

Only two controls are used on the front panel – an ‘on/off” push button and a rotary encoder. The on/off button is a ‘soft’ control; the unit actually stays powered up all of the time. In the ‘off” mode, the display is blanked except for the far right decimal which acts as a standby indicator, and the voltage output is set to zero. Also, while in this mode, the rotary encoder is not active so that the previously selected voltage will be maintained when the unit is powered back on.

Read More Source:http://mondo-technology.com/index.html
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Categories: Microcontroller, Power supply Tags: bench power supply, Microcontroller, pic-microcontroller

AVR ISP Programmer by 74HCT244

This board can program an AVR microcontroler ATMEL (ATmega8, ATMega32, …) from a parallel printer LPT1 using ISP functionality In System Programming. This programming type can program and/or configure microcontroler directly on the target board without rmoving device and put it on a separate programmer. This board is compatible with programming software

Dual Fan Controller by ATtiny45

Each fan turns off when the temperature drops 5 degrees below its turn-on temperature. For example, if the dial is set to 80 degrees, the fan turns on at 80 degrees and turns off at 75 degrees. This prevents the fan from cycling on and off rapidly, which would occur if the fan turned on at 80, started to cool the cabinet, and then immediately turned off at 79.