Hello,
Is there any reference designs / documentation or ideas on how we can wake up NRF51 when there is radio activity on a specific frequency ?
In our design, we need the device to operate on coin-cell battery for as long as possible. Two devices must automatically find each other when they are in a close range. Currently, we are running in Bluetooth Low Energy mode, and each device must stay most of its time in RX mode (>12mA).
We would like the device to transmit a low energy wake up signal that the other device would receive and then trigger the full bluetooth capabilities. This way, most of the device time would be in sleep mode.
Any kind of wake up signal module would be fine if it can spread 2 to 5 meters, be low cost and small.
Thank you!
Simon