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+# Geiger counter based on ESP32 with OLED display and thingspeak channel
+
+- Low power mode for battery power supply without WiFi, only with OLED display and click sounds
+- WiFi mode for thingspeak data upload
+
+# Hardware
+
+- Russian Geiger counter tube STS-6 at 400 V with ~5 MOhm
+- High voltage circuit from ArnoR at mikrocontroller.net https://www.mikrocontroller.net/topic/380666, schematic https://www.mikrocontroller.net/attachment/273334/HystereseStepUpTLC555-2.png
+- ~400 µs pulses generation using voltage divider, darlington transistor and TLC 555 timer
+- ESP 32 board Wemos Lolin32
+- OLED 128x64 with controller SH1106 at I2C
+- Voltage supply from USB or power supply or 3x1.5V AAA batteries, works from 3.0 V up to 5.0 V
+
+![Circuit Board](media/geiger-counter-pcb.jpg)
+
+# Software
+
+- Eclipse sloeber project using Arduino library, ESP-IDF for sleep functions and u8g2 for display output