NetBSD Wiki/users/mbalmer/
Playing With Sensors
(Notes from a little Workshop during HAR 2009)
- GPIO: LEDs, Switches, Multi-position keylocks, receiving the german DCF77 time signal station (maybe), using GPIO pins to build a 1-Wire bus
- 1-Wire bus: Digital thermometers
Hardware Notes
Soekris net4801 GPIO pins wrong in manual
The GPIO Pins in the Soekris net4801 manual are utterly wrong (at least there is a manual, unlike for the net5501, although one with many errors...).
| JP5 Pin | PC87366 Pin | JP5 Pin | PC87366 Pin | JP5 Pin | PC87366 Pin | JP5 Pin | C87366 Pin |
| 3 | GPIO16 | 4 | GPIO17 | 5 | GPIO18 | 6 | GPIO19 |
| 7 | GPIO20 | 8 | GPIO21 | 9 | GPIO22 | 10 | GPIO23 |
Connecting a LCD module to the 4801 JP5
This example assumes a DIP162 module.
LCD 4801 Function PC87366 Pin 1 11 GND 2 2 VCC 3 nc VEE (Kontrast) 4 12 RS, GPIO8 GPIO4 5 13 RW, GPIO9 GPIO5 6 15 Enable, GPIO10 GPIO13 7 3 D0 Display Data LSB, GPIO0 GPIO16 8 4 D1, GPIO1 GPIO17 9 5 D2, GPIO2 GPIO18 10 6 D3, GPIO3 GPIO19 11 7 D4, GPIO4 GPIO20 12 8 D5, GPIO5 GPIO21 13 9 D6, GPIO6 GPIO22 14 10 D7, GPIO7 GPIO23 15 nc 16 nc 17 nc LED+ 18 nc LED-
Connecting a DS18B20 to Soekris 5501 JP5
__________
| |
| DS18B20 |
Vin -----------
| 1| 2| 3|
| | | |
_ o---|----|
| | | |
4k7|_| GND |
| |
| |
uC -------o--------------------
2 = DQ -----> Pin X / GPIO x
1 = GND -----> Pin 20
3 = Vdd GND when using parasite power
Vin = 5V -----> Pin 2
External References
In english
In german
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