Будь здоров!

А можно сделать, чтобы две кнопки нажал-1, отпустил-0, а третья нажал-1, отпустил- 1, нажал- 0, отпустил - 0 то есть вкл. выкл. , Надо для приемника
1 - включение, 2,3 - переключение каналов, спасибо.

Нашел у Вас , извиняюсь, сасибо.

Hello.
Can You modify firmware for circuit in attachment ?
When You press first button on remote or MASTER button, Output A is active ( high ) and remains active until next press on remote or MASTER button ( something like Power ON ).
Output B and C are SLAVE. They can be controlled only if output A is active. They should be momentary. Press on remote - output active ( high ), release remote - output low.
What about fuses ? RSTDISBL should be unchecked.

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Thanks.
I will try it.

Tested without MASTER button - works nice.
But, just a tiny modification is needed: When apply power, Output A is active ( high ). It would be much better if Output A is low when power is applied.