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4-bit Pozidriv 0.54 Inch 14-segment LED Digital Tube Module Red / Green I2C Control 2-line Control LED Display Screen Module
US$6.99 US$11.99

Q: Please also offer these in yellow

Asked by jeremyd2019 on 2019-08-21 04:40:44

wujiahui Thank you for your suggestion. Currently only red and green, the follow-up may be yellow

2019-08-21 08:24:18 Helpful (0)
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jeremyd2019 13/06/2018
Unlike SKU 1181876, was able to successfully boot a Raspberry Pi Zero W powered by this board and 2x AAA NiMH batteries. These boards are also quite small, so have a better chance of fitting into the case I'm using. I am a little concerned about over-discharging the batteries with this, since I don't think it has any UVLO feature, and the Pi doesn't have an analog input so I can't monitor the battery voltage from software. One of these had a piece chipped off of the ferrite core of the inductor, apparently during shipping. The piece was in the bag with the board it came off of.
5pcs DC-DC 1.25-5V To 5V 1A Boost Power Module Dry Battery / Lithium Battery Step Up High Power Board With Undervoltage Indicator Function Conversion Efficiency 90%
US$5.76 US$6.19
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jeremyd2019 13/06/2018
Bought to try to power a Raspberry Pi Zero W from 2x AAA (I know, bad idea, but the pi is a retrofit into a case that already has a 2x AAA battery compartment). This module caused the pi to go into a boot loop, because when the current draw from the pi spiked, the battery voltage dropped below the shutdown voltage of 2V (presumably due to their internal resistance) and the output voltage then dropped to match the battery voltage instead of being boosted to 5V. Also, one was damaged in shipping and had a piece broken off of one of the inductors.
5PCS DC Boost Converter 2A Power Supply Module 2V-24V To 5V-28V Adjustable Regulator Board
US$7.99 US$14.39
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