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Holger Fleischmann
2019-04-14 18:21:04 +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
- Low power mode for battery power supply with OLED display and click sounds, WiFi off - Low-power mode for use with batteries, OLED display and click sounds on, WiFi off
- WiFi mode for thingspeak data upload every minute using WiFi => https://thingspeak.com/channels/758223 - WiFi mode for thingspeak data upload every minute, see https://thingspeak.com/channels/758223
[![https://thingspeak.com/channels/758223](media/thingspeak.png)](https://thingspeak.com/channels/758223) [![https://thingspeak.com/channels/758223](media/thingspeak.png)](https://thingspeak.com/channels/758223)
![Circuit Board](media/geiger-counter-pcb.jpg) ![Circuit Board](media/geiger-counter-pcb.jpg)
@@ -9,9 +9,9 @@ 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 MOhm - Russian Geiger counter tube STS-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!* - 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!*
- ~400 µs pulse generation using voltage divider, darlington transistor and TLC 555 timer - ~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 from 3.0 V up to 5.0 V
@@ -24,4 +24,4 @@ Feel free to use this project as a base for your own projects AT YOUR OWN RISK!
- Eclipse sloeber project using Arduino library, ESP-IDF for sleep functions and u8g2 for display output - Eclipse sloeber project using Arduino library, ESP-IDF for sleep functions and 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`