This full H bridge allows for the binary (on-off) and directional (plus-minus) control of current through it’s two outputs, each Interface Board has two L298P’s thus allowing for the control of upto four 150 mW LASER diodes or one 150 mW LASER diode and three magnetorquers. In software you simply call the Energize(H4, POS, 1500) function in DeathStarDriver.spin to control output devices H4 using positive 5 Volts for 1.5 seconds.