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jwillmer
jwillmer
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As you also asking about hardware I would recommend the following setup:

For sensors that only need to send data I would go with a ATtiny85. It has very low power consumption, is very small and easy to program. If you use 10-N of them then a programming board and only the micro controller will be cheaper and even smaller.

For sensors that have some logic on it, maybe multiple attached sensors I would go with a Wemos D1 Mini. It has build in WIFI, you can debug it, it is still very small and there are a ton of extension (shield) boards for it to speed up your development.

For the communication part I would go away from WIFI since 20+ devices can generate quiet some traffic. Also WIFI costs you a lot in terms of power consumption since it is not optimized for IoT (small data packages). I would add a 433mhz Mini Low Power RF Receiver/Transmitter to my IoT hardware and communicate through that. It has a long range and has a very small power footprint.

Additionally you could think about using a Wemos as MQTT gateway between your 433mhz devices and the WIFI instead of your proposeproposed Raspberry Pi solution. The nice benefit is that you will have a dedicated device managing an MQTT gateway that is far less error-prone as a Linux server (Raspberry Pi) and you don't need to update as often as with the Pi to keep it secure. There is a Wemos D1 Mini Pro that has a better WIFI antenna and a little bit more power that could be perfect for this use case.

The MQTT protocol is perfect for a sensor network since it is optimized for low bandwidth, high latency, and fragile connections. It supports Quality of Service (QoS) and you can configure what shall happen if a device disconnects/is not reachable anymore. There are a lot of library's already available for MQTT so that the setup is very quick. HiveMq has a nice how to get started with MQTT guide for further reading.

As you also asking about hardware I would recommend the following setup:

For sensors that only need to send data I would go with a ATtiny85. It has very low power consumption, is very small and easy to program. If you use 10-N of them then a programming board and only the micro controller will be cheaper and even smaller.

For sensors that have some logic on it, maybe multiple attached sensors I would go with a Wemos D1 Mini. It has build in WIFI, you can debug it, it is still very small and there are a ton of extension (shield) boards for it to speed up your development.

For the communication part I would go away from WIFI since 20+ devices can generate quiet some traffic. Also WIFI costs you a lot in terms of power consumption since it is not optimized for IoT (small data packages). I would add a 433mhz Mini Low Power RF Receiver/Transmitter to my IoT hardware and communicate through that. It has a long range and has a very small power footprint.

Additionally you could think about using a Wemos as MQTT gateway between your 433mhz devices and the WIFI instead of your propose Raspberry Pi solution. The nice benefit is that you will have a dedicated device managing an MQTT gateway that is far less error-prone as a Linux server (Raspberry Pi) and you don't need to update as often as the Pi to keep it secure. There is a Wemos D1 Mini Pro that has a better WIFI antenna and a little bit more power that could be perfect for this use case.

The MQTT protocol is perfect for a sensor network since it is optimized for low bandwidth, high latency, and fragile connections. It supports Quality of Service (QoS) and you configure what shall happen if a device disconnects/is not reachable anymore. There are a lot of library's already available for MQTT so that the setup is very quick. HiveMq has a nice how to get started with MQTT guide for further reading.

As you also asking about hardware I would recommend the following setup:

For sensors that only need to send data I would go with a ATtiny85. It has very low power consumption, is very small and easy to program. If you use 10-N of them then a programming board and only the micro controller will be cheaper and even smaller.

For sensors that have some logic on it, maybe multiple attached sensors I would go with a Wemos D1 Mini. It has build in WIFI, you can debug it, it is still very small and there are a ton of extension (shield) boards for it to speed up your development.

For the communication part I would go away from WIFI since 20+ devices can generate quiet some traffic. Also WIFI costs you a lot in terms of power consumption since it is not optimized for IoT (small data packages). I would add a 433mhz Mini Low Power RF Receiver/Transmitter to my IoT hardware and communicate through that. It has a long range and has a very small power footprint.

Additionally you could think about using a Wemos as MQTT gateway between your 433mhz devices and the WIFI instead of your proposed Raspberry Pi solution. The nice benefit is that you will have a dedicated device managing an MQTT gateway that is far less error-prone as a Linux server (Raspberry Pi) and you don't need to update as often as with the Pi to keep it secure. There is a Wemos D1 Mini Pro that has a better WIFI antenna and a little bit more power that could be perfect for this use case.

The MQTT protocol is perfect for a sensor network since it is optimized for low bandwidth, high latency, and fragile connections. It supports Quality of Service (QoS) and you can configure what shall happen if a device disconnects/is not reachable anymore. There are a lot of library's already available for MQTT so that the setup is very quick. HiveMq has a nice how to get started with MQTT guide for further reading.

Source Link
jwillmer
jwillmer
  • 111
  • 1
  • 7

As you also asking about hardware I would recommend the following setup:

For sensors that only need to send data I would go with a ATtiny85. It has very low power consumption, is very small and easy to program. If you use 10-N of them then a programming board and only the micro controller will be cheaper and even smaller.

For sensors that have some logic on it, maybe multiple attached sensors I would go with a Wemos D1 Mini. It has build in WIFI, you can debug it, it is still very small and there are a ton of extension (shield) boards for it to speed up your development.

For the communication part I would go away from WIFI since 20+ devices can generate quiet some traffic. Also WIFI costs you a lot in terms of power consumption since it is not optimized for IoT (small data packages). I would add a 433mhz Mini Low Power RF Receiver/Transmitter to my IoT hardware and communicate through that. It has a long range and has a very small power footprint.

Additionally you could think about using a Wemos as MQTT gateway between your 433mhz devices and the WIFI instead of your propose Raspberry Pi solution. The nice benefit is that you will have a dedicated device managing an MQTT gateway that is far less error-prone as a Linux server (Raspberry Pi) and you don't need to update as often as the Pi to keep it secure. There is a Wemos D1 Mini Pro that has a better WIFI antenna and a little bit more power that could be perfect for this use case.

The MQTT protocol is perfect for a sensor network since it is optimized for low bandwidth, high latency, and fragile connections. It supports Quality of Service (QoS) and you configure what shall happen if a device disconnects/is not reachable anymore. There are a lot of library's already available for MQTT so that the setup is very quick. HiveMq has a nice how to get started with MQTT guide for further reading.