Hi All,
Is anyone interested in an adapter that would allow an RM Young serial or 0-5v anemometer to be connected to a VP2 ISS (or standalone anemometer transmitter)? We have a need for such a device and have put one together. We're currently testing a prototype and the next revision of the PCB is on it's way from China. We'll likely do one or two more revisions before calling the design finalized. Any input on what should be included is welcome.
Prototype:
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Next Revision:
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This is not something we'd be selling but if people are interested we can share the design files on github. We've kept the design as simple as possible and 100% through-hole for easy assembly. The board does require 12-24v DC (mains adapter or solar) but it does allow for a single cable to connect to the ISS and provide wind direction, wind speed, 5v for ISS power, and 2.5v for fan power. No ISS modifications are required. I'll post a photo of the ISS tomorrow.
We're still dialing in the performance via firmware but we're getting there. I've attached some screenshots from weatherlink.com. Red is a RM Young 9200 connected to an ISS on channel 1 and blue is a stock VP2 anemometer on a separate transmitter on channel 2. This is our test setup:
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A few notes:
1) The 9200 is configured to update once per second (same as the Davis/LCJ sonic sensor) and take 200 samples per second (likely much higher than the Davis/LCJ sonic sensor).
2) The wind direction gap at north still exists. The VP2 is built around this and there's nothing we can do about it. Some resolution is also lost due to the wireless protocol stuffing the direction into 256 values.
3) The 9200 is has a much lower starting speed and thus wind direction is much more responsive to light winds. This could be adjusted via the 9200 configuration if desired.
4) We've tested emulating wind speeds up to 200MPH. So there is no practical upper limit imposed by the adapter.
5) Tested anemometers are RM Young 9100, 9200, 86000, and 05103V. However, basically any serial output or 0-5v output anemometers will work with firmware adjustments
6) We'll likely add RS485 support in the final design
7) Pinouts for the two RJ45 ports and the ISS connections currently look like this:
ADAPTER I/O PORT (RJ45):
1) Green/White (3.3v)
2) Green (5v)
3) Orange/White (GND)
4) Blue (TX TTL)
5) Blue/White (RX TTL)
6) Orange (SDA)
7) Brown/White (SCL)
Brown (A0/DAC)
ADAPTER ISS PORT (RJ45):
1) Green/White (ISS +5V)
2) Green (ISS GND)
3) Orange/White (WIND V+)
4) Blue (WIND DIR)
5) Blue/White (WIND GND)
6) Orange (WIND SPEED)
7) Brown/White (FAN +2.5V)
Brown (FAN GND)
ISS WIND (RJ11):
1) Orange/White (WIND V+)
2) Blue (WIND DIR)
3) Blue/White (WIND GND)
4) Orange (WIND SPEED)
ISS PWR (RJ11):
1) Green (ISS GND)
2) No Connect (CABLED ISS DATA)
3) No Connect (CABLED ISS DATA)
4) Green/White (ISS +5V)
FAN PWR (Molex 2510 Female):
1/Black) Brown (FAN GND)
2/Red) Brown/White (FAN +2.5V)