https://devzone.nordicsemi.com/f/nordic-q-a/29259/how-to-calculate-current-from-square-pulsesmy device giving output as square pulses.but would like to control current from the range 50uA to 500uA of square pulses.how to calculate it. can someone help meen-USTelligent Community 13Mon, 08 Jan 2018 15:29:52 GMThttps://devzone.nordicsemi.com/thread/116385?ContentTypeID=1Mon, 08 Jan 2018 15:29:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:80c27049-e0a7-4560-bfef-2a51974893beMartinBL<ul> <li> <p>The output voltage on the GPIOs will always be the same as your supply voltage (Vdd).</p> </li> <li> <p>The GPIOs on the nRF51 can be configured to supply up to 0.5mA in standard drive and 5mA in high drive.</p> </li> <li> <p>You can use timers and GPIOs to make a square wave with various frequencies and duty cycles.</p> </li> <li> <p>If you need to control the current sent into the electrodes you will need additional circuitry.</p> </li> <li> <p>Since the output voltage is constant you will need to know the load resistance to calculate the current (ohm&#39;s law).</p> </li> <li> <p>I suppose you can measure the current, but then you will need additional circuitry again.</p> </li> </ul><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/116387?ContentTypeID=1Mon, 08 Jan 2018 08:55:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cc5801c5-4165-42ee-a9dd-2479defe5575milner<p>I need to connect my nrf51822 to an electrode. and an electrode is connecting to rat brain.but the square pulses should be controlled. a current of the square pulses should be in the range of 50uA to 500uA. how to calculate the current and voltage from the square pulses</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/116386?ContentTypeID=1Mon, 08 Jan 2018 07:51:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:74eea4a7-e3ce-489b-a5bc-5917c5dfb62fMartinBL<p>Can you describe your use case in more detail? What have you connected to the output that is supposed to draw 50 to 500uA?</p><div style="clear:both;"></div>