You asked for it, there it is. This week-end we done several test for the Dash7. Dash7 and 433MHz mainly, has it’s advantages but it has shown it’s weakness too.
Anyway we wish to go forward with the sub 1-GHz communication. But time is also running out. We are going to do two types of WaDeD modules.
The first one is a none optimised for low consumption module (not completely unoptimised). We will use a STM32L connected with either a XBee module or a Wizzimote. Wizzilab did the thing well, the pins are similar for the two module. This architecture has the best chance to see a WaDeD working.
The second one is low-consumption optimised, but it implied to code our own radio layer. It is finally composed of a STM32L and a SX1231H that allow us to emit to +20DBm. With what we had observed this week-end this could be useful. But It implied a high consumption. We are going to have many improvement to do to limit the time of communication.
You should have notice that also want to make a system which will wake up the MCU, when the sound around the WaDeD reach a certain level. It could be very useful for saving energy in some situation. I’m currently testing a circuits with a electret microphone. I’m having problem with electric noise, which is higher than the noise of a normal conversation around the circuit. I want to specify this circuits quickly, as I said time is running out. Tomorrow this has to be set, and the schemas started.