Merge pull request #4 from ssisbit/ssisbit-patch-1

document the hardware

hardware/README.md

@@ -0,0 +1,35 @@
+# ssis:bit hardware
+
+The foundation of the ssis:bit is a [LilyGo T8 ST7789](https://circuitpython.org/board/lilygo_ttgo_t8_s2_st7789/) board with [CircuitPython](https://circuitpython.org/). It has already many key features out of the box:
+
+- ESP32-S2 with 240 MHz CPU, 4GB Flash, 8GB PSRAM
+- 1.14" ST7789 Display 240x135
+- WIFI4 2.4 GHz
+- microSD card slot for sensor data or images
+- battery charging circuit, on/off power switch
+- USB-C connector
+
+![T8 running CircuitPython](ssis.bit_2022-01-06.jpg)
+
+To make it even easier and versatile to use we added a secondary PCB to add the following functionality:
+
+- QWIIC I2C connector for sensors and other perepherial 
+- 3 buttons as input (menu selector)
+- 500 mAh battery in space between the PCBs
+- MPU6050 accelerometer and magnetometer and temperature sensor
+
+## v1.0 First official edition
+
+Ordered at PCBway this is the first official PCB to share with our students.
+
+## v0.2 3-way selector
+
+We got some ... from Aliexpress and the protptype looks like this
+
+## v0.1 first prototype
+
+`2022-01-06`
+
+The first boards arrived early January 2022 and this is the first soldered PCB with a 500 mAh battery:
+
+\[picture\]