HS402 Oscilloscope series are quite good DIY oscilloscopes designed for higher performance respect the HS10X series while keeping the best ratio performance/cost/ease to build.
Power consumption is also one of the lowest in the market (~40mA). They can be used only with HScope app for Android (since version 2.2.7).
HScope is in continuous development thanks to the suggestions from the users and the contributions of the supporters, and aim to become one of the best affordable high-tech diagnostic tool.
Consider to support this project with a donation!
Intro
A 2 Channel oscilloscope based on STM32F4x1 Black Pill development board. It provide long memory buffer and high real-time transfer speed.
Technical Specifications
| Channels | 1 or 2 |
| Input Range | Can be built with one of the following variants: Single range bypolar (ie. ±5V) | PRO (multiple ranges, selectable on app interface) PRO input ranges ±16V, ±8V, ±4V, ±1.6V, ±500mV |
| Sampling Rate | STM32F401 2 KSa/s – 1.4MSa/s 2.8MSa/s, 3.8 MSa/s not linear rates STM32F411 2 KSa/s – 1.6MSa/s 3.2MSa/s, 4.2 MSa/s not linear rates |
| ADC Resolution | 8-12 Bits (8 bit @ max rate, 10bit @ 100KSa/s, 11bit @ 25KSa/s) |
| Input Noise | Schematic Option 1 0.4% MAX @ 1.4MSa/s 0.12% MAX @ 140KSa/s (in real-time, 2 Channels, 10 bit) <0.01% @ 50KSa/s (in real-time, 2 Channels) Cross-channel noise: 0.05% Schematic Option 2 (REF2033) 0.17% MAX @ 1.4MSa/s 0.13% MAX @ 800KSa/s 0.09% MAX @ 400KSa/s (10 bit) 0.05% MAX @ 200KSa/s <0.06% @ 160KSa/s (real-time, 2 Channel, 11 bit) <0.05% @ 50KSa/s (in real-time, 2 Channels) Cross-channel noise: 0.25% |
| Bandwidth | STM32F401 700 KHz STM32F411 1MHz |
| Input Impedance | 1 Mohm (1.010 kOhm) |
| Memory Buffer | STM32F401 16K samples (half when use 2 channels together) 32K @ 3.8 MSa/s STM32F411 32K samples (half when use 2 channels together) 64K @ 4.2 MSa/s |
| Trigger | STM32F401 Hardware – checked after each complete scan, not centered, may loose samples STM32F411 Hardware, real-time, position within first 500 samples |
| HW Options Supported | – AC/DC Coupling Module – PWM Output Generator – Input Buttons Module to control basic oscilloscope functions (eg. Start/Stop, sampling rate,..) |
| Modules Supported in HScope | – Automotive Module up to*: STM32F401 280 KSa/s single channel, 140KSa/s with 2 channels STM32F411 320 KSa/s single channel, 160KSa/s with 2 channels – Audio Module – PWM Generator: supported up to 1 MHz, duty cycle 1-99% |
| OS Version | Android 7+ (Android 4.4 supported but Automotive Module cannot reach more than 100KSa/s for 1 channel and 50KSa/s for 2 channels) |
*performances dependent from Android hardware and OS version. Check required OS Version. Suggested CPU 2.1GHz+
Built By The Users
Take a look to the HS402 Oscilloscopes build by the users! Available also the 3D files for printing the box!
Additional Information
Sponsors 2020-2021
This project has been developed with the support of:
