2 channel receiver for rc boat
**broken link removed**
You need one 2-channel encoder AND a different carrier frequency per boat.
Making this all by yourself is going to be tricky, because you won't be able to easily divide up your carrier frequency evenly. Buy 433MHz modules that can do 6 channels and use a different channel for each boat.
Oh, and if you want more help, start writing in a language that doesn't make you sound like a "l33t sp34k" idiot.
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Agronski.