Open source lab-grade automated microscope

BeanCounter: Simple, battery powered, pocket-sized open source parts counter for 8mm cut tape and partial reels (schematics, source code, etc.)

BeanCounter is a pocket-friendly SMT parts counter. Powered by a CR2032 coin cell battery, it uses two infrared photointerrupters to count parts as quickly as possible. It works with any opaque, 8 mm wide carrier tape up to 2 mm, and it covers most 0805 or smaller LEDs and passives, as well as SOT23 transistors.

Schematic PCB

Discrete ultrasonic range finder

This program can realize the ultrasonic ranging function, and has functions such as LCD display, serial port output, and changing range.

Schematic PCB

Pomelo, a low-power, open-source gamma-ray spectrometer

Schematic PCB

Digital capacitance meter made with AT89C2051 microcontroller

As a simplified version of AT89C51, AT89C2051 removes P0, P2 and other ports, reducing the number of I/O ports. However, it adds a voltage comparator, so its functions are enhanced in some aspects. For example, it can be used to process analog Quantity, simple analog-to-digital conversion, etc. This article uses this function to design a digital capacitance meter, which can measure the capacity of capacitors with a capacity less than 2 microfarads. It uses a 3-and-a-half-digit digital display. The maximum display value is 1999. The reading unit is uniformly nanofarads (nf), and the measuring range is divided into In the fourth gear, the readings are multiplied by the corresponding magnification.

Schematic PCB

Waveform generator including schematic diagram + circuit diagram + program

The microcontroller uses MCS-51 series 89C51 (one piece), 74LS244 and 74LS373 (one piece each), inverting driver ULN2803A (one piece), and operational amplifier LM324 (one piece)

Schematic PCB

acoustic-leak-detector: open source, battery-powered, long-range acoustic leak detection

AquaPing is an ultra-low power smart sensor that provides isolated water leak detection, even behind walls.

Schematic PCB

Esai source code biofuel and gutter oil rapid detector

Esai source code biofuel and gutter oil rapid detector

Schematic PCB

Oscilloscope source code based on stm32f4

A good source code for stm32f4 oscilloscope, which can use 3-channel ADC to measure waveforms and display the waveforms on the screen and also display the amplitude.

Schematic PCB

0-30v 0-10A variable power supply with adjustable voltage and current

Schematic PCB

W84219ASJ75_lighting detector

2-layer PCB 38.7 x 49.5 mm FR-4, 1.6 mm, 1, with wire spray tin, red solder mask, white silkscreen; lightning detector.

Schematic PCB

High efficiency digital power solution source code

Schematic PCB

DSCope portable open source oscilloscope circuit design project source file based on FPGA design

Schematic PCB

PIC30v voltmeter schematic diagram

The 30v voltmeter made with PIC16f676 includes schematic diagram and source program.

Schematic PCB

Open source smart bracelet project reference solution based on NRF51822

Schematic PCB

Design of digital oscilloscope based on STM32 (complete design information)

Schematic PCB

FPGA Signal Generator Schematic Design Reference

Schematic PCB

The EVAL-AD5520EB, AD5520 evaluation board is a single-channel, per-pin parametric measurement unit (PPMU) for use in semiconductor automatic test equipment

Schematic PCB

Design of digital oscilloscope based on STM32 (complete information)

Schematic PCB