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making a shield for the l298n
The L298n is a cheap ($2.95 on Sparkfun), motor which has high current output capabilities (up to 4A), and can be controlled by TTL from the Arduino (5V ttl compatible).
There's a fair amount of wiring involved, as well as a combination of diodes, capacitors, and current sensing resistors (low resistance resistors).
I will aim at first to target the Uno R3 platform, but will also create one for the Mega if 123d.circuits.io allows.