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HS402-WiFi Building Instructions

  • February 13, 2000June 21, 2021
  • This project is currently under testing (Mar 2021)
  • Project material can be found here in Github, other resources at the end of this page
  • It is suggested to join the Telegram group to get more info and support

Hardware

To build the HS402-WiFi oscilloscope you can choose among these 2 options.

1. Easy Built

You need:

  • HS402 oscilloscope (built with PCB V2.0 or PCB V3.0) with Firmware ver. ≥ 1.7
  • ESP32 Development board (one with ESP32-WROOM first version or ESP32-WROOM-32D), connected to STM32 as following and flashed with latest ESP32 Firmware. Flashing instructions here.
  • You can also use a PCB adapter created by Mikael to connect the ESP32 and STM32 together. Look at this project here, usage video here.
ESP32 board can be very different but from these schematic it could be possible to find the right pins.

2. Full Built (with PCB v3)

  • A compact built using PCB v3 which integrate all the components, including the ESP32-WROOM chip
  • PCB v3 is composed by 2 parts that need to be separated. Then main PCB is for the standard HS402 USB oscilloscope, the small PCB is the WiFi Module.

You need:

  • Get PCB v3, split the 2 board along the separation line by using a knife on both side and the apply a pression on both side to take the 2 board apart.
  • Solder all the components. A demo of the STM installation for PCB v3 is here.
  • Flash the STM32 and the ESP32
  • Put the WiFi Module over the HS402 long connector (top right)
  • Power from BAT connector (3.6 – 5V) or from USB connector of the STM32

After just follow the User Guide to connect the WiFi configuration page.

Firmware / Software

  • STM32 with HS402 Firmware ver. ≥ 1.7
  • ESP32 with latest Firmware
  • HScope Android app ver. ≥ 214

Powering with Battery

1. With 5V Battery Pack

  • Possible with whatever hardware built

Just connect a classic phone charger to the USB port of ESP32 or of the STM32 to power up the oscilloscope.
You can also disassemble a phone charger and add a switch for power, as done in this video.

2. With 3.7V Lithium Battery

  • Possible only by using the hardware Option 3 in the PCB v3

With the hardware Option 3 in the PCB v3 it is possible to power the oscilloscope directly with a 3.7V Lithium battery. You can add also a micro-charger circuit as in the following schematic. This configuration allow the lower power consumption for this device (around 180mA avg).

Resources

  • Open Source Hardware Schematic for HS402-WiFi V3.0 available here.
HS402-WiFi User Manual
Audio Module Intro

Related content

  • HS402 DIY Oscilloscope
  • HS402 – Building Instructions
  • HS402 – Additional Modules
  • HS402 Tests – USB Connection

  • Built By The Users
  • Related Products

  • HS402-WiFi DIY Oscilloscope
  • HS402-WiFi User Manual
  • HS402-WiFi Building Instructions
  • HS402-WiFi Built By The Users
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