arduino-dsmradio

Arduino Library implementing the DSM Serial protocol to enable MLP4DSM or DX4e radio support.

Minimum hardware requirements

• Arduino with 3.3v power
• mlp4dsm or dx4e/dx5e DSM Radio from Spektrum Controller

DSM Radio protocol settings and definiton

The DSM Radio protocol transmits 14-byte frames every 22.5 ms.

• The frame includes a 2-byte header and six 2-byte channels of information.
• The header may be set to 0x80 to bind the transmitter to a new receiver, otherwise it is set to 0.
• Each channel is capable of storing a 10-bit value but actually uses a smaller range.
• Instead of 0-1024, the effective range is closer to 170-852.
• The radio should be connected to the serial TX pin which will be set to 125000 baud.

mlp4dsm pinout

dx5e pinout

Here's the full RCGroups forum thread discussing the DSM Radio protocol and its arduino implementation as a PPM to DSM module.