SEN0626 Gesture and Face Detection Module failures

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The SEN0626 Gesture and Face Detection Module failures are usually caused by power, communication, or environment issues rather than a faulty sensor. First, check that the module is receiving a stable power supply. An unstable or low voltage can cause random resets, frozen output, or no detection at all.

Next, verify the I2C connection and address. Wrong wiring, loose jumper cables, or using an incorrect I2C address often results in the device not being detected by the microcontroller. Also make sure the correct library and firmware version are installed, as older libraries may not fully support the SEN0626 features.

For face and gesture recognition, lighting conditions are very important. Very low light, strong backlight, or fast hand movement can reduce accuracy or cause detection failures.

Isn't there any way to reset the module? 

Chat was right. I was setting the pins as high output after setting them as inputs in code and back powering the unit. Finding and deleting the code and putting in a level shifter seems to have solved it. I didn't even kill the gesture sensor. So now I have a spare, or two :)

So I had an interesting discussion with chatgpt about this. It believes that the sensor could be destroyed quickly or slowly by the arduino back powering through the I2C pins when VCC is at 0 volts. Below is its final recommendations for level shifters to prevent this, for whatever advice from and AI is worth. I guess I will risk another $15 for a third module and see if it works.

--from Chatgpt----

The DFRobot SEN0626 Gesture & Face Detection module is a 3.3 V I²C device with 5-V-tolerant I/O, and it already has some quirks that matter for level shifting.

Key facts about SEN0626 (important)

Supply voltage: 3.3 V (it has an onboard regulator if powered from 5 V on VIN)

Logic level: 3.3 V

I²C mode: Open-drain, standard I²C

Onboard pull-ups: ⚠️ Yes, weak pull-ups are usually present

Sensitive to bus weirdness: yes (vision modules often are)

This makes robust, boring I²C the goal 😄

Best level shifter choices for SEN0626 + Arduino Nano

🥇 Best overall (my strong recommendation)

BSS138-based I²C level shifter board

Examples:

SparkFun Bi-Directional Logic Level Converter

Adafruit I²C-Safe Level Converter

Generic “4-channel IIC I²C level shifter” boards (JY-MCU style)

Why this is ideal for SEN0626

✔ Designed specifically for I²C
✔ Handles power-up order safely
✔ Tolerates onboard pull-ups on the SEN0626
✔ Works perfectly with Nano’s 3.3 V pin
✔ Rock-solid at 100–400 kHz