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Holger Fleischmann
2019-04-22 11:29:11 +02:00
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# IoT Geiger Counter with ESP32, OLED Display and Thingspeak Channel # IoT Geiger Counter with ESP32, OLED Display and Thingspeak Channel
- Measures radioactive gamma and beta radiation with already quite good resolution at the typical low levels of the background radiation (due to the big STS-6 tube) - Measures radioactive gamma and beta radiation with quite good resolution at the typical low levels of the natural radiation (due to the big STS-6 tube)
- Displays the current counts per minute (CPM), estimated dose equivalent rate in micro-Sievert per hour (µS/h) and 10 minutes history with 5 second resolution as bargraph - Displays the current counts per minute (CPM), estimated dose equivalent rate in micro-Sievert per hour (µS/h) and 10 minutes history with 5 second resolution as bargraph
![Circuit Board](media/geiger-counter-pcb.jpg) ![Circuit Board](media/geiger-counter-pcb.jpg)
- Low-power mode for use with batteries, OLED display and click sounds on, WiFi off - Low-power mode for use with batteries, OLED display and click sounds on, WiFi off
@@ -11,19 +11,19 @@ Feel free to use this project as a base for your own projects AT YOUR OWN RISK!
# Hardware # Hardware
- Russian Geiger counter tube STS-6 at 400 V with ~5 MΩ series resistor - Russian Geiger counter tube STS-6 (CTC-6) at 400 V with ~5 MΩ series resistor
- High voltage circuit from ArnoR at mikrocontroller.net https://www.mikrocontroller.net/topic/380666, schematic https://www.mikrocontroller.net/attachment/273334/HystereseStepUpTLC555-2.png. *Keep the high-voltage capacitor small to avoid dangerous charges! For safety avoid any contact with the high voltage parts!* - High voltage circuit from ArnoR at mikrocontroller.net https://www.mikrocontroller.net/topic/380666, schematic https://www.mikrocontroller.net/attachment/273334/HystereseStepUpTLC555-2.png. *Keep the high-voltage capacitor small to avoid dangerous charges! For safety avoid any contact with the high voltage parts!*
- ~400 µs pulse generation using Geiger tube series resistors as voltage divider, high impedance input to darlington transistor and TLC 555 timer for rectangle pulse generation - ~400 µs pulse generation using Geiger tube series resistors as voltage divider, high impedance input to darlington transistor and TLC 555 timer for rectangle pulse generation
- ESP32 board Wemos Lolin32 - ESP32 board Wemos Lolin32
- OLED 128x64 with controller SH1106 at I2C - OLED 128x64 with controller SH1106 at I2C
- Voltage supply from either USB or power supply or 3x 1.5V AAA batteries, circuit works from 3.0 V up to 5.0 V - Voltage supply from either USB or power supply or 3x 1.5V AAA batteries, circuit works stable from 3.0 V up to 5.0 V
- Pulse input is expected at GPIO 18 (high pulses with at least about 250 µs length) - Pulse input is expected at GPIO 18 (high pulses with at least about 250 µs length)
- Switch for WiFi mode is expected at GPIO 4 (low=WiFi mode, high=low-power mode) - Switch for WiFi mode is expected at GPIO 4 (low=WiFi mode, high=low-power mode)
- OLED I2C bus is expected at GPIO 22 (SCK) and 21 (SDA) - OLED I2C bus is expected at GPIO 22 (SCK) and 21 (SDA)
# Software # Software
- PlatformIO project using Arduino library, ESP-IDF for sleep functions and U8g2 for display output - [PlatformIO VSCode project](https://github.com/platformio/platformio-vscode-ide) using [Arduino](https://github.com/arduino/Arduino) library, [Espressif ESP-IDF](https://github.com/espressif/esp-idf) for sleep functions and [U8g2](https://github.com/olikraus/u8g2) for display output
- Low-power mode uses light sleep, a wake-up for each signal pulse change and a wake-up every 1000 ms to update pulse statistics and OLED. This results in about 90% sleep. Could be improved using deep sleep and ULP. However, light sleep is already quite good and much easier. - Low-power mode uses light sleep, a wake-up for each signal pulse change and a wake-up every 1000 ms to update pulse statistics and OLED. This results in about 90% sleep. Could be improved using deep sleep and ULP. However, light sleep is already quite good and much easier.
- WiFi mode uses no sleep and simple interrupts for pulse counting. Pulse statistics and OLED are updated every 1000 ms, data is sent to thingspeak every 60 s. - WiFi mode uses no sleep and simple interrupts for pulse counting. Pulse statistics and OLED are updated every 1000 ms, data is sent to thingspeak every 60 s.
- Credentials (WiFi SSID, password, thingspeak channel key) are only declared in `credentials.h` and must be defined in a `credentials.cpp` - Credentials (WiFi SSID, password, thingspeak channel key) are only declared in `credentials.h` and must be defined in a `credentials.cpp`