From 058795dad1e52c0de82d12fb4cddf0c73051d6b9 Mon Sep 17 00:00:00 2001
From: Holger Fleischmann <33845511+grillbaer@users.noreply.github.com>
Date: Sun, 14 Apr 2019 17:35:18 +0200
Subject: [PATCH 1/2] Create README.md

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 README.md | 18 ++++++++++++++++++
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 create mode 100644 README.md

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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
+
+
+# Software
+
+- Eclipse sloeber project using Arduino library, ESP-IDF for sleep functions and u8g2 for display output

From a7dcc2fbbebad7c97474e0781fa2e185789a3a58 Mon Sep 17 00:00:00 2001
From: Holger Fleischmann <33845511+grillbaer@users.noreply.github.com>
Date: Sun, 14 Apr 2019 17:37:22 +0200
Subject: [PATCH 2/2] Update README.md

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 README.md | 1 +
 1 file changed, 1 insertion(+)

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--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@
 - 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