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The hardware of the UM24 USB tester is not very complex and not hard to understand as it is the software which tells more about what this product can do and what it is used for. With the two USB ports for its input, the male Type A USB port and the male micro-USB port for the input voltage, and the female Type A USB port for its output to the load, this meter can be utilised for most electronic devices, with some slight exceptions, off course. There are also four buttons located on this module, as you can see on the below picture. Two on top of the module and two on the bottom of the module which are for different functions in the 7 menu pages. Then, there is the 1.44" LCD display, which is located in the centre of this meter, which we will go through in the below sections. If you have not realised, there is actually a serial port which is very unnoticeable at the top of the module, but in between the layers on the meter. You could use that port to try and change the firmware or code this module manually. Refer to the images below to see each side of this module:


How to use this module (connect the input power and load)

To set up the connections (input power supply and output load) for this USB meter to measure, there isn't really a lot to do so let's get into it right away. If you have a Type A Female USB connection for an input power supply, make sure you plug your supply into the Type A Male USB port located on the left side of the module, as seen in the picture below. However, if you have a Male micro-USB connection for the input power supply, you can plug that in to the Female micro-USB port located on the top of the module, as seen in the picture below as well. For the output load connection, you have to make sure your load connects to the Type A Female USB port on the right side of the module. The images below show the Female micro-USB input and the Type A Male USB input being used with the Type A Female USB port for the load:


Menu Page 1: Information Overview

Now, we will cover the first menu page of the UM24 USB meter, which is the home page and the first thing you look at when the module is powered up. As you can see in the picture below, there are 7 white dots on the top of the display which show which menu page you are currently on, the larger white dot indicates the page you are on and the rest are the remaining pages from left to right (pages 1 - 7), this applies to all of the menu pages. On this page, you can find your input voltage, which is +5.08 volts (green text) in this case, and the current the LCD screen is drawing, which is 0.228 amps (light blue text) in this case. To the left of the input voltage, there is the ambient temperature reading (yellow text) which this meter is sensing (which is 29°C in this case), and below that temperature reading is the group reading (red text) which tells you which group you're on right now (Group 0 in this case). More about the memory groups and how it all works will be mentioned below. Then, below the text where the groups are mentioned, there is a resistance display (dark blue text), which indicates the resistance of the whole circuit (22.2Ω in this case), followed by the wattage (white text / 1.158W in this case) below. To the left of the resistance display, the mAh is displayed (red text), which is the amount of electrical charge used within an hour (12 mAh). The mWh (yellow text), the amount of electrical energy used within an hour (60 mWh), is also displayed below the mAh reading. Plus, at the bottom of all of the menu pages, are two button labels, "HELP" and "NEXT", which can be toggled with the buttons (bottom left and bottom right buttons). All of what the buttons can do will be written below:

PictureIf you click on the bottom left button which is marked as "HELP" on the display's...

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