Teensy++2.0 sub for Mega 2560?

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DanL

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New to this. Wrote a small, clunky beginner Arduino sketch for a Mega2560 using 27 digitalWrite outputs and a couple digital inputs. I realize now that the Mega is overkill and that I need solderable outputs on the permanent circuit for a somewhat rough, damp environment.

Will the ++2.0 work instead of trying to use the Mega?

Need 5V operation. Outputs are to a total of 18 relays and 9 LEDs:
Max of 4 relays at once (on 5V Relay Opto-couple For ARM AVR DSP Arduino, Relay interface boards) with a max of 4 sec on-time. Relay boards have separate power supply. 20mA ea.
Max of one LED at once, on-time<1sec, 15mA

Estimated max simultaneous board output current about 100mA. Max per-pin output 20mA

If not ++2.0, any other recommendation please?
 
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