Mini Pocket Thermal Imager — 32x32 Open Source

Demo & Resources

• YouTube Demo
• GitHub (Open Source)
• OSHWHub Project Page

What is it?

A mini pocket thermal imaging camera built on the Heiman HTPA32x32 sensor, running on a Raspberry Pi RP2040 (ARM) chip. Weighing just 20g, it fits in your pocket and works the moment you power it on — no phone, no app, no setup required.

Designed by Umeko Studio and completely open source — full code, schematics, and materials provided for free secondary development.

Use Cases

• Hotel room privacy inspection (hidden camera detection)
• Floor heating leak and pipe detection
• Electrical equipment temperature monitoring
• Power maintenance and fault finding
• Indoor pet location (cats, dogs)
• General infrared thermography

Key Specifications

• Sensor: Heiman HTPA32x32
• Native resolution: 32×32
• Display resolution: 240×240 (after bilinear interpolation algorithm)
• Screen: 320×240 touch screen, 2.5D glass front
• Temperature range: -20°C to 1000°C
• Temperature accuracy: ±3°C
• Frame rate: 7 Hz (average)
• Pseudo-color modes: 5 types
• Battery: 600 mAh — 3.5 hours continuous use, 1.5 hours charge time
• Interface: USB Type-C
• Weight: 20g
• MCU: Raspberry Pi RP2040 (ARM Cortex-M0+)

Software Features

• Bilinear interpolation + mosaic removal for smooth 240×240 output
• DMA + shift interpolation for high refresh rate
• Emissivity adjustment for accurate surface temperature measurement
• Gamma correction — magnify detail in low or high temperature areas
• Fixed-point temperature curve display + data download to PC
• Manual temperature calibration (slope & intercept) + automatic sensor error calibration
• Screen mirroring (left/right, top/bottom) and 360° rotation
• Auto or manual temperature range adjustment
• PC host software for wired thermal image sync and curve recording
• Long-term stable software updates — community suggestions actively considered

Colors Available

Black / Orange / White / Yellow