Send RPM value to receiver

[billis-xania]

Hi, first of all big thanks to this amazing library! I want to make my own rpm sensor for my plane, i can send values to the futaba receiver from my esp32 but i have problem with rpm, for example i use "send_RPM(RPM_SLOT,(uint16_t) 500);" and in futaba i have the number 62 in this slot(of course i have set the slots and the sensors from futaba settings). I try with voltage and it works, i know that it must be something in conversion of the number in the code or in futaba. Do you know what is wrong? Thank you for your time.!

[ericlangel]

Hello, the RPM Sensor is one of the easy going sensors. There is not so much conversation.

So at first lets check your hardware: Which Futabe TX? Which Futaba RX? -> some RX are known for "more trouble" Which Sensor is selected? -> there are several rpm sensors possible Which ESP32? -> normal esp32, C2, C3, S2, S3? Which ESP32 Arduino Core Version?

could you try 0 and 1 for the rpm value and tell me the displayed value?

[billis-xania]

So i use: Futaba T16SZ(FASSTest 18ch) Futaba R7008SB I try with all of the RPM sensors in your code(send_RPM, send_SBS01RB, send_SBS01RM, send_SBS01RO, send_SBS01R), in the Futaba Tx menu: "sensor" -> it has only one rpm sensor "rpm sensor"

    ESP32 DOIT DEVKIT V1 - esptool.py v4.2.1

    Arduino IDE 1.8.19
    In "board manager"  -> "ESP32 BY ESPRESSIF SYSTEMS 2.0.5"
    In "board"              -> "ESP32 DOIT DEVKIT V1"

    For example :
    send_SBS01RB(RPM_SLOT,(uint32_t)0);         ->      Futaba Tx(rpm sensor): 0
    send_SBS01RB(RPM_SLOT,(uint32_t)1);         ->      Futaba Tx(rpm sensor): 0
    send_SBS01RB(RPM_SLOT,(uint32_t)500);       ->      Futaba Tx(rpm sensor): 62
    send_SBS01RB(RPM_SLOT,(uint32_t)1000);      ->      Futaba Tx(rpm sensor): 124
    send_SBS01RB(RPM_SLOT,(uint32_t)1000000);   ->      Futaba Tx(rpm sensor): 49151

    send_RPM(RPM_SLOT,(uint32_t)500);               ->      Futaba Tx(rpm sensor): 62
    send_SBS01RM(RPM_SLOT,(uint32_t)500);       ->      Futaba Tx(rpm sensor): 62
    send_SBS01RO(RPM_SLOT,(uint32_t)500);       ->      Futaba Tx(rpm sensor): 62
    send_SBS01R(RPM_SLOT,(uint32_t)500);                ->      Futaba Tx(rpm sensor): 62

Here is a simple code just for testing

Sbus2_write.zip

[ericlangel]

T16 SZ and R7008SB should be fine your sketch with Timer should be fine, too.

i'am wondering about the value 62

The RPM Value is divided by 6 -> transmitted via SBUS2 and Fasstest -> and multiplied by 6 on your T16SZ

so every RPM value is a factor of 6

so there is no way to transmit a value of 62 -> it should be 60 or 66

But the T16SZ RPM Sensor has additional settings

Can you check your Sensor Type and Gear Ratio? i think this setting is "wrong"

[billis-xania]

Yes, yes you were right! The setting was: "Sensor type" -> "Magnet", "Gear ratio" -> "8.00" and I changed it to "1.00" and it works just fine.!

Another question now, I want to use the Arduino pro mini, which version should I choose "3V3" or "5V"? Thank you for your fast response!

[ericlangel]

you can use both, but 3v3 is more easy going.

But with pro mini you need some electrical parts for inverting the SBUS Signal. if you just want to have a smaller MCU you could have a look on the RP2040 project

https://github.com/mstrens/oXs_on_RP2040

[billis-xania]

Very nice project with the RP2040. Thank's again for your help.

[ericlangel]

so i think i can close the issue

[billis-xania]

Yes, you can close the issue and here is my project! I didn't have 1/4watt resistors!

[ericlangel]

and is it working?

[billis-xania]

Yes, it's work just fine. I'll send also the code if anyone want it. RPM_sensor_SBUS2_pro_mini.zip

[jianwen0527]

Hello! Your code cannot be successfully edited, prompt:no matching function for call to 'SimpleTimer::setInterval(long int, void (&)())'

[billis-xania]

Hi, can you try with the following library? SimpleTimer-master.zip

[jianwen0527]

Thank you! Successfully compiled!