Dilshan R Jayakody’s Web Log

The HX711 is a versatile integrated circuit (IC) designed for precision analog-to-digital (A/D) conversion, particularly suited for strain gauge load cell applications. It features a 24-bit A/D converter with a differential input stage capable of handling both single-ended and differential input signals. Additionally, this device offers adjustable gain amplification to accommodate various load cell sensitivities. HX711 module. A common module based on the HX711 available in the market, including on AliExpress , is shown below. This module utilizes its internal analog supply regulator, which ensures a stable analog supply (AVDD) for the ADC and other internal components. The output voltage of the regulator (AVDD) is calculated using the following formula: V AVDD = V BG × (R1 + R2) / R2. AVDD voltage test setup. According to the electrical characteristics listed in the datasheet, the reference bypass voltage (V BG ) is 1.25V. For the modules mentioned, R1 is set at 8.2kΩ and R2 at 20k...

This is PIC16F73 base digital data capture unit with optional EMF reader. This data capture utility is design to work with most of the analog sensor inputs and by default, it is equipped with the EMF reader module. This unit use PIC16F73's internal 8bit ADC to capture the analog signals. EMF reader unit in this schematic is useful to detect variations of EM field in the environment and it is mainly built around uA741 operational amplifier and 12mH detector coil . Normally EMF meters are used to trace electric wires, find hidden transmitters, and diagnose electric wiring problems ( and to find ghosts too ☻ ). This digital data capture unit can operate in 2 modes. In the first mode, it directly converts an analog signal into digital data and transferred to the host via a serial interface. In second mode it displays captured signal in 5 LED bar graph either slow or high-speed capture modes. This unit is designed to work with 5V 500mA power source and to get optional EMF reading...