Review of the Pokit pro – smart phone multimeter, oscilloscope and data logger.

The pokit pro is a nall-in-one multimeter, oscilloscope and data logger. It is a probe which connects to a mobile phone using bluetooth. So no need for bulky screens or to carry a laptop around with you.

This was a Kickstarter from 2019. Originally due to be delivered in 2020 these are a little under 2 years overdue. There has been a global pandemic and some technical issues that had to be resolved and fortunately we were kept updated about the progress.

In this video I go through an unboxing of the pokit pro. I then go through the steps to pair it with a phone (including firmware update) and then some examples of it working. I first use it as a multimeter to measure the voltage of a battery and then connect it to a microbit to monitor a PWM signal using the oscilloscope function.

There are apps available for different mobile phones. The Android app is available from the Google play store and the Apple app from the app store.

All in all I’m very impressed with the product. A useful tool for any maker wanting to debug a simple electronics circuit. It was well worth the wait.

Testing with a MicroBit

In the video I measure the PWM signal from a microbit. Below is the code that I used to provide a variable pwm output based on the in-built buttons.

from microbit import *

pwm_value = 0

while True:
    if button_a.is_pressed():
        pwm_value -= 1
        if (pwm_value < 0):
            pwm_value = 0
        sleep (300)
    elif button_b.is_pressed():
        pwm_value += 1
        if (pwm_value > 9):
            pwm_value = 9
        sleep (300)
    display.show(pwm_value)
    pin0.write_analog(1023/9 * pwm_value)

More information on pokit

See the Pokit pro website for more information.

Screenshots

Here are some screenshots showing some of the features

DC voltage multimeter

Oscilloscope showing PWM with frequency, period, peak-to-peak and duty cycle

Oscilloscope showing PWM with RMS and duty cycle