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19 Commits

Author SHA1 Message Date
Mario Hüttel d6eaf980c9 Add current date and revision to schematic 2020-02-18 20:52:50 +01:00
Mario Hüttel 9da3edbf16 Re-enumerate components. This finilizes draft version for V1.2 2020-02-18 20:19:59 +01:00
Mario Hüttel adf0a2afb9 Improve ESD protection of DIGIO Pins 2020-02-17 20:40:35 +01:00
Mario Hüttel d894012b73 Re-annotate components 2020-02-05 18:58:36 +01:00
Mario Hüttel fa6782c21d Prepare for v1.2 
* Remove voltage buffer Opamp after TL431PK because it may oscillate
* Replace TL431PK with TL431LI. Stabilized by very large capacitance (> 10uF)
* Add panic passives to differential amplifier in order to avoid oscillaton. Values as they are now should work.
* Remove external ADC. Tests with version v1.1 show that the precision of the STM's ADC is sufficient, (once all oscillations are damped by modifying the circuit)
* Power whole OpAmp circuit with 3.3 volts in order to eliminate the need for the clamping diode at the ADC pin. This diode showed a high reverse current over temperature, which affected the measurement.
 2020-02-05 18:30:34 +01:00
Mario Hüttel 6806a29e54 Add solder jumpers for connection between Earth and GND 2020-01-03 20:39:53 +01:00
Mario Hüttel b529535ae8 Schematic: Re-annotate everything 2020-01-03 20:05:39 +01:00
Mario Hüttel 4e5bc3bae7 Schmatic: Improve layout in schematic 2020-01-03 20:04:57 +01:00
Mario Hüttel 6546664939 Revert "Schematic: Redo component annotations" 
This reverts commit 458f3d9769.

* Changing annotations and propagating the changes to the board are not possible anymore
 2020-01-03 18:42:32 +01:00
Mario Hüttel 458f3d9769 Schematic: Redo component annotations 2020-01-03 18:38:16 +01:00
Mario Hüttel cff848f02f Small fixes and improvements 
* Card detect pin used
* Fix SD card slot
* Improve routing and via placement
 2020-01-03 18:34:21 +01:00
Mario Hüttel 2c4c15e72b Replace custom opamp circuit with INA126 instrumentation amp 2020-01-02 00:08:09 +01:00
Mario Hüttel a307557a41 Improved layout, Add QR code, Add external ADC option for 22 bit ADC 2019-12-26 18:01:55 +01:00
Mario Hüttel fe646769e7 Schematic beautify and layout improvments, Length matching for SDIO 2019-12-25 19:15:32 +01:00
Mario Hüttel c8e420bd08 Played around 2019-12-25 01:19:01 +01:00
Mario Hüttel a698e0b0e5 Add temperature sensor to PCB for compensation calculation. 2019-12-25 00:20:13 +01:00
Mario Hüttel c211cf659b Newest changes in schematic and a preliminary complete layout 2019-12-23 22:25:38 +01:00
Mario Hüttel 585ef85fab PCB rework started 2019-10-02 14:12:33 +02:00
Mario Hüttel 93ec69fa19 Fisrt draft. Will be reworked 2019-09-22 18:42:43 +02:00