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Updated Variant PPM (markdown)

Candas1
2022-01-02 11:57:47 +01:00
parent 8be69932f1
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Variant-PPM.md

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This variant can be used with PPM-SUM RC Receivers.<br> This variant can be used with PPM-SUM RC Receivers.<br>
As opposed to PWM, it will send all channels on a single wire one after the other.<br> As opposed to PWM, it will send all channels on a single wire one after the other.<br>
Default number of channels for PPM in config.h is 6 (Successfully tested Flysky fs-i6ab receiver with 8 channels).
## Configuration/Parameters
CONTROL_PPM_RIGHT is for the right sensor cable and is set by default to limit the noise as this cable is shorter.<br>
You can use CONTROL_PPM_LEFT instead if you need to use the left sensor cable.<br>
DEBUG_SERIAL will be automatically enabled on the opposite cable.<br>
PPM_NUM_CHANNELS is the number of channels for PPM and is 6 by default. As an example Flysky fs-i6ab receiver is sending 8 channels even when used with a 6 channel transmitter<br>
## Wiring: ## Wiring:
* Connect PPM port of your receiver to green wire on right sensor cable(shorter) * Connect PPM port of your receiver to green wire on right sensor cable(shorter)
* PPM is highly prone to noise : keep cables short, use 100nf capacitors, use shielded cable, use ferrites, stabilize voltage * PPM is highly prone to noise : keep cables short, use 100nf capacitors, use shielded cable, use ferrites, stabilize voltage
⚠ Red wire from sensor cable delivers 15v !!! ⚠ Red wire from sensor cable delivers 15v !!!
Use 3.3v from programming port, 5v from hall sensor cable, or a voltage regulator. Use 3.3v from programming port, 5v from hall sensor cable, or a voltage regulator.
@@ -23,6 +27,6 @@ If the board is [beeping](https://github.com/EmanuelFeru/hoverboard-firmware-hac
* Check the number of channels, even if you transmitter only handles 6 channels, you receiver might transmit more channels * Check the number of channels, even if you transmitter only handles 6 channels, you receiver might transmit more channels
* Make sure you enabled PPM on your transmitter * Make sure you enabled PPM on your transmitter
* Make sure you use the PPM port on your receiver * Make sure you use the PPM port on your receiver
* Make sure you are using the sensor cable(left or right) selected in config.h * Make sure you are using the sensor cable(left=CONTROL_PPM_LEFT or right=CONTROL_PPM_RIGHT) selected in config.h
* On some boards the wire colors might differ, try the blue wire * On some boards the wire colors might differ, try the blue wire
* You might have a defective input, because of a fried resistor or MCU pin (e.g. [issue](https://github.com/EFeru/hoverboard-firmware-hack-FOC/issues/244)), you can configure the firmware to work on the other cable * You might have a defective input, because of a fried resistor or MCU pin (e.g. [issue](https://github.com/EFeru/hoverboard-firmware-hack-FOC/issues/244)), you can configure the firmware to work on the other cable