Hello,
I try to find a cheap and ultra low-power wireless module to embedded on a battery powered sensor board I am designing.
This board is intended to make grid monitoring of temperature and soil moisture in my garden.
As I need around few tens meters range, I thought about BLE and Zigbee modules.
I have some difficulty to find cheap module (around 3-4$ or less) and make a choice between the numerous existing modules.
I can go the simpler way and use a communication module only with a simple MCU, like the ATTiny441. Or try the hard way and use a module with a SoC. This could be a nice exercise.
The cheapest modules I have found are mainly in China, but I not have enough experience to judge them :
E104-BT06, E104-BT12, E104-BT52, E18-MS1-PCB, JDY-23, JDY-24, JDY-25.
I will greatly appreciate any advice about this very interesting subject.
Thanks in advance