Changes between Version 13 and Version 14 of WikiStart

Timestamp:

Sep 28, 2013, 10:31:22 PM (12 years ago)

Author:

dominic

Comment:

--

WikiStart

@@ -34 +34 @@
     - Alternative way of Pi power supply: A USB charger to power the Raspberry, just make sure it can deliver at least 1000mA
   - Flarm <--> Pi Data connection
-   - Flarm delivers RS232 signal on its data port. To feed this signal into the Pi, there are presently two alternatives
-   - RS232-USB-cable: Buy a RS232 to USB converter cable. Preferable one which uses the FTDI chipset (e.g TBD). If you use a different chipset, this may not be supported by default by the Pi operating system.
+   - Flarm delivers RS232 signal on its data port. To feed this signal into the Pi, there are presently two alternative ways of doing:
+   - RS232-USB-cable
+    - Buy a RS232 to USB converter cable. Preferable one which uses the FTDI chipset (e.g TBD). If you use a different chipset, this may not be supported by default by the Pi operating system.
+    - Attach the converter to your Flarm and to one of the USB connectors on the Pi
+   - Serial-In of the Pi
+    - The Pi features a serial interface (UART) on its GPIO pins.
+    - Pi's serial interface works on 3.3V. Hower, Flarm supplies higher signal levels. DO NOT CONNECT THE FLARM DATA LINES DIRECTLY TO THE PI'S GPIO PINS!!!
+    - Buy a RS232 to TTL level shifter (e.g. [http://www.ebay.de/itm/115200bps-Stucke-Mini-RS232-auf-TTL-Converter-Module-Konverter-Board-MAX3232-/261070156589?pt=Wissenschaftliche_Geräte&hash=item3cc8fe732d E-Bay] - costs less than 2 EUR)
+    - Solder Flarm's TX, RX and ground (coming from the RJ45 jack) onto the RS232 side of the level shifter. Most level shifters have well labeled soldering pads
+    - Solder 4 wires to the TTL side of the level shifter. Ground, +3.3V, TX and RX need to be connected
+    - Buy a 2x13 IDC connector which attaches to the Pi's GPIO pin headers (e.g. [http://de.rs-online.com/web/p/idc-steckverbinder/3237902/ RS-Online]
+    - Connect the four wires coming from the TTL side of the level shifter to the IDC connector. Pin layout depends on the version of your Pi. See [http://wiringpi.com/pins/ GPIO Pins] GND, +3.3V, RX and TX must be connected
+    - Disable console output and boot messages on the serial interface. See [http://www.irrational.net/2012/04/19/using-the-raspberry-pis-serial-port/ here] 
+