Well firstly I fixed the issue with the lack of GPS signal. A miss read of the datasheet, the active aerial does need power imagine that. Anyway once I’d powered that up and provided power to pin2 on the ISM300 ( the battery circuit is “optional” but in the small print it says “you must hold pin 2 over 1.65v to function”. \u00a0Todays lesson is always read the datasheets carefully again and again.<\/p>\n
Once the GPS was giving location data a few hours coding on the Arduino was decrypting the NMEA string nicely. After a little\u00a0erroneous\u00a0mathematics the latitude and longditude are now converting into the correct format. One thing that threw me was when you Serial.print a float the default is it only does it to two decimal places. I thought I was loosing accuracy but the actual float does still contain the accuracy.<\/p>\n
Once the telemetry information was working I copied in the temperature sensor code and constructed the UKHAS telemetry string :<\/p>\n
$$AVA,1223,11:45:22,53.1111,1.2234,250,6,23,22*002A<\/p>\n
Where<\/p>\n
$$Call Sign,TICKER,UTC TIME,LATITUDE,LONGDITUDE,ALTITUDE,SATELLITES,TEMP INT,TEMP EXT CHECKSUM<\/p>\n
Also made the LED blink when there is no GPS lock which is currently always as the active aerial doesn’t seem to be working again, dodgy wiring probably.<\/p>\n
Need to get the NTX2 working now, on the plus side someone can loan me a radio to test it with!<\/p>\n","protected":false},"excerpt":{"rendered":"
Well firstly I fixed the issue with the lack of GPS signal. A miss read of the datasheet, the active aerial does need power imagine that. Anyway once I’d powered that up and provided power to pin2 on the ISM300 …<\/p>\n