DIY Electronics
Simple electronics as a hobby
Full adder based on NOR gates
With only transistors and resistors 9 NOR gates are built for 1 full adder. Four full adders construct a 4-bit adder. Gerber files are called full_adder3_gerber.zip
PIC16f690 and 16x2 LCD library
Step 1: Choose library projectStep 2: Create header and source file(s).
Step 3. Build and the library "name.X.a" is created.
Step 4. In a new project add the library to the libraries folder.
Step 5. Add #include "../name.X/header.h" to your main.c
Step 6: Build
>>> code of lcd16x2.c and lcd16x2.h <<<
Voltmeter pic12f675 i2c
This voltmeter is build with a pic microcontroller with I2C code to control the OLED. A boost converter is
use to power the circuit. Only batteries less than 5 volt can be measured. The code uses ADC to determine the voltage.
pms5003 sensor circuit
The importance here is to use your own datastructure and let the sensor run its serial data without
interruption. It can't handle delays. The capacitor in the circuit is just for decoupling.
Logic gates game
Touch the TTP223 button on the left to start the game. Figure out which logic gates are used in position 1,2 and 3 by touching the 4 buttons and see how the LED above logic gate 3 respond. The 4 gates that are being used are AND, OR, XOR and NAND. There is only 1 of each gate per game. When you think you know which gate goes where, touch the left button again to see the correct configuration on the display.
>>> Arduino code <<<
Alternative way of coding Arduino
Using direct Port manipulation and main() while(1) instead of setup and loop to display a number on the 7-segment display based on input of 4 dip switches. The header pins are connected to the appropriate pins of an Arduino UNO.
>>> Arduino code <<<