The examples use many of the functions so refer to them for demonstrations of how to use the common functions in your own code. The list below goes over all the available functions in the DE2120 Library along with short descriptions of what they do. The 2D Barcode Scanner Breakout measures 1.75in x 1.00in (44.45mm x 25.4mm) with two mounting holes that fit a 4-40 screw.ĭownload the SparkFun DE2120 Arduino Library Library Functions Similar to the STAT LED, opening this jumper is particularly useful when an external buzzer is connected to the buzzer driver PTH pin. Open the jumper to disable the on board buzzer. The Buzzer Jumper completes the buzzer driver circuit and connects the voltage input (positive) pin of the buzzer to 3.3V via a 10Ω resistor. Disabling this LED is recommended if you are using an external LED connected to the STAT PTH pin. Open the jumper to permanently disable the Status LED on the breakout. The STAT LED Jumper connects the anode of the status LED to a transistor via a 1kΩ resistor so it can be controlled by the barcode module. Open the jumper by severing the trace between the two pads to disable the Power LED.

The Power LED Jumper connects the anode of the power LED to 3.3V through a 1kΩ resistor. Check the Eagle Files for the specific location. The PWR jumper is covered by the DE2120 ribbon cable in this photo but we promise it' there.

2d barcode scanner