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ADAFRUIT TRINKET 5V POWER MA DRIVER
ADAFRUIT TRINKET 5V POWER MA PRO
ADAFRUIT TRINKET 5V POWER MA SERIES

In the illustration below you’ll see the difference:

ADAFRUIT TRINKET 5V POWER MA DRIVER

The 5050 LED is a very common 3 LED (Red, Green, Blue) package, in one 5mm x 5mm case.Ī WS2812 is the same package but with an additional WS2811 LED driver IC on board. The WS2812 however is a WS2811 placed inside a 5050 LED package. The WS2801 used to be quite popular but the WS2812/WS2811 appears to be taking over the reigns. Positioned close together, so you as a viewer will see the mixed color result. These IC’s can control up to 3 LEDs, typically Red, Green and Blue. The WS2801 and WS2811 are LED driver IC’s ( Integrated Circuits). The model numbers WS2801, WS2811 and WS2812 actually refer to different “things”. Most projects and descriptions out there discus these sometimes mixed, and for one who dives into LED strips for the first time, these models numbers might be confusing.

Add new modes to show measurements like the minimum, maximum, and average observed voltage & current values.Difference between WS2801, WS2811 and WS2812īefore we start, we should probably identify the differences between the WS2801, WS2811 and WS2812 based strips (also called “strands”).

Switch to a larger display that can show more measurements on screen at a time.

Add buttons to allow toggling the displayed measurements.

ADAFRUIT TRINKET 5V POWER MA PRO

Design and build a small 3D printed enclosure to hold the Pro Trinket, OLED display, INA219, and a battery to power them.Some interesting ways you might extend the project include:

That's all there is to using the power meter! You can use this project to measure the power consumption of devices you build, and even estimate how long they might run on batteries. Note that all the measurements are updated once a second, so devices with quickly changing power demands might draw spikes of current that the meter does not detect. In this example we'd expect to see about 7.1 milliamp-hours after one hour of measurements. Since a LED draws a constant amount of current, after an hour you should see a milliamp-hour value that's about equal to the average current usage of the LED. Check out this guide on batteries for more great information. If you observe the millamp-hours of current used by a device you can compare it to the milliamp-hour capacities of batteries and estimate the battery life of the device. This is a very useful measurement to understand the battery life of a device since batteries are measured in amp-hours (or more typically milliamp-hours). To start the amp-hours will be around 0, but over time they will grow based on how much current a device uses. The amp-hour measurement is interesting because it's showing how much current has been consumed by the device since the power meter was turned on. For the LED you might see values to start like:

Watts & Amp-hours - This mode shows the power at the top in watts (or milliwatts), and the observed amp-hours (or milliamp-hours) since the power meter has been powered on.

For example for an LED and 4 batteries you might see:

Volts & Amps - This mode shows the volts (or millivolts) of the power supply at the top, and the current consumed by the device in amps (or milliamps) at the bottom.

Every 5 seconds the display will change to show a new set of values, and in total there are 4 values that are displayed: You should see the meter display different power measurements. Make sure the power meter's Pro Trinket has power too as it will not power itself from the measured device's power source (you can instead plug in the Pro Trinket's micro USB connector to a power supply/computer, or even power it with batteries). Try wiring up a LED and battery as shown, then turn on the power to the batteries. This allows the power meter to read the voltage from the batteries.įinally to complete the circuit a small resistor (~560 ohm) is connected from the cathode (shorter leg) of the LED to battery ground.

ADAFRUIT TRINKET 5V POWER MA SERIES

In addition to being in series with the LED a wire connects the battery ground to the power meter ground. In this way the INA219 is in series with the power to the LED and it can measure how much current is consumed by the LED.

Then the Vin- connection on the INA219 is connected to the anode (longer leg) of the LED. In this diagram a small battery holder (4x AA) has its positive power output connected to the Vin+ connection on the INA219.