Thanks for supporting local! Our online shop is open & shipping orders. 

Search

Get Professional Support

BBC Micro:bit

Robotics

On sale items!

Announcement


Check out our latest news to find out more about events, opportunities and partnerships.

Esmes' Electronics


Esmes' Electronics is a simple introduction to using the micro:bit written by a year 5 student.

Troys' tutorials


Learn with Troy by asking for support and, he will post a tutorial here to benefit all of our visitors. Free advice!

Feature teacher


Be inspired by some of our favorite teachers using our products.

Get professional support


Contact us now to request your own tutorial or learning resource.

This section doesn’t currently include any content. Add content to this section using the sidebar.

Image caption appears here

Add your deal, information or promotional text

ADA574

Panel Current Meter - 0 to 9.99A

5 items left

Put a current meter anywhere with this very handy display. This panel meter requires a DC voltage to run, and then has two thick gauge wires to measure current draw. A shunt is already on board so its very easy to hook up!

Since current sensors are a little more complex than volt meters, and its easy to confuse the wires, please read carefully to understand how to wire it together! The current meter has two sets of wires, one thin (red and black) and one thick (red or white, and black). The thin wire set is for powering the meter itself and must be 4.5-30VDC. There is reverse-polarity protection on these wires. The thick wire set is for the in-line current sensing. The black sensing wire is tied to the black power wire internally, so depending on how you want to use the meter, you may need a separate power circuit (see the next paragraph)

The easiest and safest way to use the meter is to have no electrical connection between the powering and sensing current. That is, connect something like a 9V battery to the thin power wires and you can put the current sensor in anywhere you want. As long as the circuits are totally separate this will work great.

Another option is to have one circuit power the meter while it is sensing the same circuit. To do this, you'll need to make sure that you are low-side sensing. This is because the ground power wire is connected to the black current sense wire. To make sure you don't accidentally short your power supply, you'll need to arrange your circuit so that the ammeter sits 'right below' the "ground" of whatever you are sensing. See the image above for a diagram showing how to measure motor current, for example. Make sure the DC power is between 4.5V and 30V in this case.

The display has a microcontroller that will read the current through the shunt resistance, compare it to a stable reference and display the current in Amps on a 3-digit 0.56" tall 7-segment display. It works from 4.5V up to 30V and is reverse-polarity protected so it will be good for nearly any electronic project! The meter itself draws about 20mA to power the microcontroller and display. This particular LED display is a nice contrast red, which we found very readable. To mount to your enclosure, simply cut a 45.5mm × 26.5mm rectangle and snap it in.

How We Give Back

We believe in giving back; We are proud to give 1% of all orders directly to environmental not for profit groups whose focus is the protection, preservation and restoration of our planet. This means every time you purchase from us, 1% goes directly to an environmental cause.

Search