hi Salts,
I think a re-read of the ESP32 data notes is required to bring you up to speed.

There are very power operating mode options for the RF sections.

E

I think an anctusl experience with an ESP32 Dev board with the power Hungary voltage regulator, usb to serial adapter and more. I agree that the ESP Chip can be low power but the the module referenced will not last long as a keyboard module. If the other member would have recommended some low power circuitry and code to latch the enable pin with each keystroke, I could encourage it. I won't encourage the development board. But I do encourage you to measure the current draw on that unit for a keyboard/Bluetooth setup.

 

I think an anctusl experience with an ESP32 Dev board with the power Hungary voltage regulator, usb to serial adapter and more. I agree that the ESP Chip can be low power but the the module referenced will not last long as a keyboard module. If the other member would have recommended some low power circuitry and code to latch the enable pin with each keystroke, I could encourage it. I won't encourage the development board. But I do encourage you to measure the current draw on that unit for a keyboard/Bluetooth setup.

Will do !
*Also edit : i read the nordic module you recommended, people generally recommend between nrf51 or nrf52, which one should i use just in case, and does it need usb host shield ? Thanks !

 

Will do !
*Also edit : i read the nordic module you recommended, people generally recommend between nrf51 or nrf52, which one should i use just in case, and does it need usb host shield ? Thanks !

Here is the link to the getting started with Nordic. It is a bit dry and slow but very complete.
https://www.nordicsemi.com/Products/Development-tools/nRF-Connect-for-VS-Code/Tutorials#infotabs

 

Will do !

 

Here is the link to the getting started with Nordic. It is a bit dry and slow but very complete.
https://www.nordicsemi.com/Products/Development-tools/nRF-Connect-for-VS-Code/Tutorials#infotabs

I ordered the nrf51822 out of curiosity (and they sounded fun, so why not ?). Thank you for your recommendation MrSalt !

 

hi K93,
I would follow the advice of the poster's who are more familiar with the possible low power capabilities of the device.
ie: Someone who has taken the time to read and understand the low power RF features of the device data sheet.

Agreed, there are other devices which would also suit your application, but choose the device based on it's published features, rather than the personal bias of others.

E

 

hi K93,
I would follow the advice of the poster's who are more familiar with the possible low power capabilities of the device.
ie: Someone who has taken the time to read and understand the low power RF features of the device data sheet.

Agreed, there are other devices which would also suit your application, but choose the device based on it's published features, rather than the personal bias of others.

E

Thank you for the advice !, I did read in some article that the esp32 s2 (at least on some article) is consuming 20mA in deep sleep and the nrf51822 consume 5mA in deep sleep (which i can't test right now, since it is not arrived yet). On the other hand, the esp32-s3 from what i read from the technical pdf is super power efficient if used correctly than the nrf51822 and nrf52 (at least from the website, i have not read the technical documentation of them), but then again, the esp32 S3 price have not stabilized yet in here.

 

For an ESP32 transmitting, it takes up to 250mA while the 5-series nordic devices, it is about 15mA.
sleep modes of Nordic modules is 5uA and kind of unknown on the ESP32 DEV MODULES with USB. Note that the datasheet posted above is for the bare ESP32 chip and the sleep modes assume all of the low power tips are obeyed. The low power design recommendations are not implemented in hardware on the ESP32 MODULES & Dev Boards so there is no way to achieve the ultra low power sleep modes quoted in the datasheet. I measured 220uA for the onboard voltage regulator and USB-serial load alone for an ESP32 Dev module sitting on my bench.

here is a nice review of the two+ bluetooth options.
note the recommendation in the last paragraph of the ESP32 section. - they recommend it for mains applications only.
https://www.eeweb.com/ble-lets-compare-the-best-market-solutions/

 

hi K93,
I would follow the advice of the poster's who are more familiar with the possible low power capabilities of the device.
ie: Someone who has taken the time to read and understand the low power RF features of the device data sheet.

I completely agree. He should look to people who have used both the Nordic devices AND a range of ESP32 dev boards, modules and chips. People who favor one platform like it is a religion are not helpful. Also, read other reviews on the interwebs written by people who have used both.

Agreed, there are other devices which would also suit your application, but choose the device based on it's published features, rather than the personal bias of others.

Note that you cannot rely on the power consumption values as "published features" of a chip and expect those values to apply to the dev-board. Unfortunately, Espressif does not publis power consumption of their in-hours Dev boards and third party companies have not been publishing power consumption of dev boards based on the esp either. Anyone, please share if you find them.