Enhanced 'Parts' documentation (#514)

* Enhanced 'Parts' documentation

* Fixed type and wording in Parts_en.md

docs/Parts_en.md

@@ -8,7 +8,7 @@ Following parts are required:
 
 ***
 
-## drawer
+## Drawer
 
 - plastic drawer [download](https://github.com/universam1/iSpindel/raw/master/drawer/)
 
@@ -17,20 +17,37 @@ Following parts are required:
 
 ## Battery pack
 
-- `18650 LiIo cell` (e.g.` Panasonic NCR18650B`)
+- `18650 LiIo cell` (e.g. `Panasonic NCR18650B`)
 
 ***
 
 ## Components
 
-- [Wemos D1 mini](https://wiki.wemos.cc/products:d1:d1_mini)
+- [Wemos D1 mini](https://www.wemos.cc/en/latest/d1/d1_mini.html)
 - `GY-521` Gyro & Acceleration Sensor (MPU-6050 on suitable breakout board)
-- [DS18B20 Temperature Sensor](https://www.maximintegrated.com/en/products/analog/sensors-and-sensor-interface/DS18B20.html)
-- Square grid 3x4cm or printed circuit board
+- [`DS18B20` Temperature Sensor](https://www.maximintegrated.com/en/products/analog/sensors-and-sensor-interface/DS18B20.html)
+- Square grid 3x4cm or a printed circuit board
+  - [iSpindel PCB 4.0](https://www.pcbway.com/project/shareproject/iSpndel_4_0.html)
+  - [iSpindel The Jeffrey 2.69](https://www.pcbway.com/project/shareproject/iSpindel_The_Jeffrey_2_69___Open_Source_Distilling.html)
 - Resistors
   - 4k7 ohms
   - 220k ohms
   - 330 ohms or BAT43 diode
-- [microswitches](http://www.reichelt.de/Schiebeschalter/SS-ESP201/3/index.html?ACTION=3&LA=446&ARTICLE=112179&GROUPID=7595&artnr=SS+ESP201&SEARCH=SS%2BESP201)
-Or at the PCB [Reed Wechsler](http://www.reichelt.de/Reedrelais/KSK-1C90/3/index.html?ACTION=3&LA=446&ARTICLE=27696&GROUPID=7617&artnr=KSK+1C90&SEARCH=KSK%2B1C90)
+- [Microswitches](http://www.reichelt.de/Schiebeschalter/SS-ESP201/3/index.html?ACTION=3&LA=446&ARTICLE=112179&GROUPID=7595&artnr=SS+ESP201&SEARCH=SS%2BESP201) or at the PCB [Reed Wechsler](http://www.reichelt.de/Reedrelais/KSK-1C90/3/index.html?ACTION=3&LA=446&ARTICLE=27696&GROUPID=7617&artnr=KSK+1C90&SEARCH=KSK%2B1C90)
 - Lipo charger `TP4056` (6 pin recommended)
+
+***
+
+# Additional information
+
+## Shopping lists:
+- [rechelt.de](https://www.reichelt.de/my/1848159) (Note: select the correct battery holder depending on the used board)
+
+## GY-521 (Gyro & Acceleration Sensor)
+There are several clone sensors available that can be of poor quality. So make sure to buy them from a reliable source, e.g. the one linked in the above liked Wemos documentation.
+
+Other then that, it can be helpful to order not just one sensor and test them before soldering them onto the board.
+
+Here you find 2 options how to proceed with testing gyro sensors:
+- [Issue 429 (comment)](https://github.com/universam1/iSpindel/issues/429#issuecomment-766389383) or [Issue 512 (comment)](https://github.com/universam1/iSpindel/issues/512#issuecomment-864923729)
+- [Issue 512 (comment)](https://github.com/universam1/iSpindel/issues/512)