https://devzone.nordicsemi.com/f/nordic-q-a/90470/interfacing-of-arduino-33-ble-to-the-nrf21540Hello Everyone i am beginner in embedded domain and i have project which is about controlling under water device from the outside water through the Bluetooth in that project i am using arduino 33 ble which is used nrf52840 but ble is not working underen-USTelligent Community 13Thu, 28 Jul 2022 11:54:49 GMThttps://devzone.nordicsemi.com/thread/379112?ContentTypeID=1Thu, 28 Jul 2022 11:54:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1e5fce46-b463-4b73-aca5-df62a32a3919helsing<p>Hello Akshay,</p> <p>I assume it should be possible to use nRF21540 with Arduino 33, although I am familiar with Arduino 33. nRF2154o can be <a href="https://infocenter.nordicsemi.com/topic/ps_nrf21540/chapters/device_control/doc/frontpage.html">controlled </a>via direct pin control or the built in SPI interface. Please have a look at the <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/group__nrf21540.html">hardware drivers for nRF21540 for nRF5 SDK</a> to see how this can be done.</p> <p>I do not know why you are working with Arduino, however, you might want to consider developing using nRF Connect SDK. There are examples(like <a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.0.2/nrf/samples/peripheral/radio_test/README.html#radio-test">Radio test</a>) demonstrating how to use nRF21540 together with (for example) nRF52840. Please also see <a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.0.2/nrf/ug_radio_fem.html?highlight=nrf21540">Working with FEMs</a>.</p> <p>This is an interesting project as communicating using 2.4GH underwater is very challenging. I do not know how much work it is to set this up with Arduino, however, you could perhaps perform some tests using the nRF21540-DB along with nRF5 SDK or nRF Connect SDK before you start porting the drivers to the Arduino platform.</p> <p>Best regards,</p> <p>Håkon</p><div style="clear:both;"></div>