Quark: ESP32-based electronic measurement and debugging tool

Crowd Supply developed a project called Quark, based on the ESP32 design and using the Arduino development framework to implement a handheld device that integrates electronic measurement probes and debugging tools, is open source, and has wireless connection capabilities. The Quark is battery powered, 120 mm long, and features a full-color LCD for reading measurement data and a touch interface for easy control. The device was independently designed by the maker Sergey Ismulin, and the design files and source code were released to facilitate users to directly develop and use it.

Features and Specifications
Voltage measurement range 0 to 26 V
Current measurement range 0 to 3.2 A
Resistance measurement range 0 to 2 MΩ
Capacitance measurement range 2 pf to 1000 uF
Inductance measurement up to 1 H
Oscilloscope with 400 kHz sampling rate
UART Recorder
UART Plotter
Signal generator
Full-color LCD with 240 x 135 resolution
Touchable control buttons
Connects to smartphone APP via Bluetooth
Smartphone APP supports iOS and Android
Built-in 700 mA battery supports up to 5 hours of non-stop operation
via USB Type-C charging
All functions fully available with or without a phone
Length 120 mm
Diameter 20 mm

Technical writer Vishnu Mohanan also mentioned: "The ESP32-WROOM-32 module integrated inside Quark can drive the LCD operation and sample all measurement data. One end of the device is a tapered needle as a positive probe, and the negative/ground probe is connected to Connected to a USB Type-C port. There are no physical buttons on the Quark, and users can select functions by sliding touch-sensitive switches on the device. Its built-in 700 mA lithium polymer battery can support up to 5 hours of non-stop operation. The battery can be used Charging via the same USB." When charging, the battery indicator on the LCD will instantly display the charging status.
When measuring voltage, Quark displays whether the voltage is within the 1.8 V, 3.3 V, or 5 V logic level range; when measuring current, it displays the instantaneous value and a graph; when measuring capacitance, resistance, or inductance, it displays the value corresponding to the measured value. Corresponding color code or other code. This special feature saves users a lot of time.
The UART debug function can automatically detect the baud rate. Data received via UART can be logged for debugging. The oscilloscope has automatic and manual zoom capabilities that can display the frequency and time period of the incoming signal. Quark can also use the Bluetooth function of ESP32 to connect to Android or iOS APP to display all information on the phone. In addition, Quark uses the ESP32's 12-bit internal ADC for all measurements.