Writing string to characteristic?

[Zander-M]

Hi, I'm wondering if you could provide a function to write a string to a characteristic? On line 104 you use the Uint8Array.of() function to parse the input value, in that case we can't write a string to a characteristic. Perhaps it can be changed to something like:

const bufferToSend = new Uint8Array(toUTF8Array(inputValue));

so we can send value to the device? If it's a design choice, could you please let me know the reason for this? Thank you!

[ragrag]

Faced this issue as well and used

const bufferToSend = new TextEncoder("utf-8").encode(inputValue);

[yining1023]

Hi @Zander-M and @ragrag, thank you so much for your suggestions!

I updated the library to support writing strings from p5 sketch to Arduino. You can use p5.ble.js@0.0.7 to send string to Arduino:

<script src="https://unpkg.com/p5ble@0.0.7/dist/p5.ble.js" type="text/javascript"></script>

On the Arduino side, you might need to add this line to read the string: https://github.com/ITPNYU/p5.ble.js/blob/9de8a6b3e8153af9538e454fa436af23f7f4716c/examples/writeOneChar/arduino-sketches/write-one-char-ArduinoBLE/write-one-char-ArduinoBLE.ino#L70

Here is a demo video about how to send strings to Arduino: https://www.loom.com/share/7a179dea008c420dace27900baa9c444 Here are the p5 sketch and the Arduino code used in the demo video.

Thank you both for using p5.ble.js and please let us know if you have other feedback!

[ragrag]

@yining1023 Thank you so much for that!

[Zander-M]

Thank you so much! This helps a lot! <3