This wiki is not maintained! Do not use this when setting up AuScope experiments!

Differences

This shows you the differences between two versions of the page.

--- operations:temphumidmonitor_hardware [2019/03/25 22:53]
Jim Lovell [Hobart and Yarragadee]
+++ operations:temphumidmonitor_hardware [2019/04/03 23:22] (current)
Jim Lovell [Connections for the DHT22 sensors to the RJ45 bus]
@@ Line 67: / Line 67: @@
     * [[https://www.adafruit.com/product/1083|ADS1015 12-Bit ADC - 4 Channel with Programmable Gain Amplifier]]
-==== Connections for the DHT22 sensors ====
+==== Connections for the DHT22 sensors to the RJ45 bus ====
 The DHT22 has 4 pins but pin 3 is not used.
-{{ :hardware:dht22-pinout.png?direct |DHT22 pinout}}
+{{ :hardware:dht22-pinout.png?direct%300 |DHT22 pinout}}
+Each one requires a connection to power and ground plus a unique GPIO port on the Raspberry Pi for data. The RJ45/CAT5 has 8 wires. Two are reserved for power and earth so that leaves 6 for sensors. The RJ45 terminal blocks have a different wire colouring to the CAT5 cable. Here's how they are allocated:
+^ RJ45 Pin number ^ CAT5 wire colour ^ RJ45 terminal block wire colour ^ GPIO# or power assignment ^ ID on unit ^
+| 1 | orange/white | grey    | 4 | TH1 |
+| 2 | orange       | orange  | 17 | TH2 |
+| 3 | green/white  | black   | 18 | TH3 |
+| 4 | blue         | red     | +3.3V |
+| 5 | blue/white   | green   | GND |
+| 6 | green        | yellow  | 27 | TH4 |
+| 7 | brown/white  | blue    | 22 | TH5 |
+| 8 | brown        | brown   | 23 | TH6 |