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WIFI DTMF ROBOT: 5 steps



you need to connect four pin data output trays on the dtmf module to four pin data inputs on the diy engine driver, this module can work with minimum voltage of 2.3 volts and the engine driver can work with at least 3 volts that is why i can go power up the dtmf module and driver from a single 3.7 volt battery, and I separately supply 7.2 volt battery for motors as shown below


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