bunnypranav/hermesTH1Hermes-TH is a small PCB that combines a temperature and humidity sensor, pressure sensor, and accelerometer, specifically the AHT20-F, AGR10, STK8328-C with a tiny OLED display, all controlled by a XIAO RP2040.
HermesTemp is an open-source printed circuit board by bunnypranav, from the bunnypranav/hermesTH repository on GitHub. It is a 2-layer board of 36 × 55 mm with 16 parts on 32 nets, routed with 83 tracks and 13 vias.
It is built around the AHT20, RP2040-ZERO and STK8328-C. Its parts include 7 capacitors, 4 ICs and 2 resistors. It belongs with the RP2040 boards of this library.
Hermes-TH is a small PCB that combines a temperature and humidity sensor, pressure sensor, and accelerometer, specifically the AHT20-F, AGR10, STK8328-C with a tiny OLED display, all controlled by a XIAO RP2040. The idea was to make a simple I2C-based board that reads environmental data that actually matters in my life, namely temperature, humidity, and pressure (unlike carbon monoxide for example), and displays it directly on a screen.
Made in KiCad
The XIAO RP2040 module handles everything. D4 and D5 are used for I2C (SCL and SDA), which are shared by the AHT20, OLED, and the accelerometer. The accelerometer is an analog device and read through the ADC pins of the RP2040, specifically A0. All other components are simply controlled through the I2C bus and everything is powered with 3.3V from the RP2040. The OLED is a 128x64 pixel display, which is more than enough for displaying all statistics.
Made in KiCad
| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C4, C5, C6 |
| 2 | 10uF | Capacitor_SMD:C_0805_2012Metric | C3, C7 |
| 2 | 4.7k | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | LOGO | LOGO | G***, P2 |
| 1 | AHT20 | hermesExtraFoot:SENSOR-SMD-6_AHT20 | U4 |
| 1 | RP2040-ZERO | hermesExtraFoot:MODULE_RP2040-ZERO | U2 |
| 1 | STK8328 | hermesExtraFoot:VLGA-12_L2.0-W2.0-P0.50-BL | U1 |
| 1 | ~ | hermesExtraFoot:LGA-8_L3.8-W3.6-P0.90-TL_WF183D | U3 |
| 1 | ~ | hermesExtraFoot:OLED-TH_HS96L01W4S03 | OLED1 |
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It measures 36 × 55 mm and has 2 copper layers, 1.6 mm thick.
16 parts, built around the AHT20, RP2040-ZERO and STK8328-C. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the bunnypranav/hermesTH repository on GitHub, at the commit this page was made from: the board is PCB/hermesTemp.kicad_pcb and its schematic PCB/hermesTemp.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask bunnypranav before reusing the design.
