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I am running an HM-10 Bluetooth Low Energy (BLE) module to transmit serial data (using SoftwareSerial) from an analog sensor onboard my Arduino Uno to a serial terminal app on my Android phone. When I power the Arduino with a USB power bank, the data transmits flawlessly.

When I tried to power the Arduino with a 9V battery through the DC power jack instead of USB power, the BLE module connects to my phone, but no data is transmitted when a serial connection is established.

Any ideas why this would be?

dda
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AggroCrag
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2 Answers2

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Take two 9 volt batteries with same specifications and connect them in parallel. By using this efficiency of current increases and it may full fill the current requirement at the time of data transmission, and for others modules you are using with the Arduino.

Gil Sven
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RoboPathshala
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A PP3 battery is not a suitable power source for an Arduino.

For battery powered operations I would recommend a set of AA batteries with between 6 and 8 volts (if you don't care about bulk) or a Li-Ion battery (or two) and a suitable buck or boost (depending on number of cells) regulator to bypass the inefficient linear regulators on the Arduino.

Majenko
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