The assembly of this LED persistence of vision kit started well but it soon went bad because of poor design and lack of instructions. There is no documentation on how to assemble the mechanical parts so you have to figure that out yourself. There is no mention or pictures of how the LED’s should be soldered and to my surprise they need to be soldered on the edge of the PCB. There is no information on how to load the firmware or custom text patterns. After some research I did manage to find a chinese app which is supposed to work with this kit but I had no success in writing/uploading anything to the microcontroller.
I even spent an hour or so with google translate and, translated to english most of the buttons and messages in the app.
At this point I’m not sure if my problem is in the hardware(unlikely) or if I need to program the microcontroller, or if the microcontroller has some firmware and I just need to upload a custom display pattern using that chinese app.
Too much time & effort has been wasted so I’m not going to follow this anymore. My recommendation: don’t buy this kit unless you have too much free time and you enjoy solving complicated (chinese) problems.
This is a product unboxing of the Xiaomi Yi. A few words about the specs of this camera: It is using a Sony CMOS 16MP sensor with 155 degree wide angle lens, it’s capable of 1080p @ 60fps, 720p @ 120fps, come withs BT 4.0, Wifi. All this made possible by the Ambarella A7LS SoC.
In this video I am switching my HP 3478A from 120V 60Hz AC to 230V 50Hz AC using the internal selection. I am also comparing some voltage and resistance measurements to my Keithley 175 and I realize the HP needs calibration if I am to trust it’s measurements. While I was inside the meter I also checked the voltage of the internal battery used to store calibration data.
In this InTheMail segment I receive the HP 3478A 5.5 digit multimeter, a Probe Master 8028s test lead set, the Anker Astro E3 10000mAh portable battery charger and the Seagate Expansion 2TB external storage hard drive.
In this video I am assembling a 0-30V 0-3A Adjustable Linear Power Supply kit. Will it work at first power on? Or will Murphy get me this time? Watch the video and see how I got myself into trouble. I also reverse engineered and got a schematic of this kit which I am showing towards the end of the video.
A list of the items I show on this InTheMail video:
2.4 inch 320×240 px TFT display module based on the ILI9341 lcd controller, complete with touchscreen, uSD card slot, 128Mbit flash, independent font chip and the required power circuitry.
ESP8266 modules (3 different variations), a small solar panel, waterproof enclosure and Li-ion battery cells. uSD card holder thing. 13W LED 5050 E27 lightbulb. Breadboad + breadboard power supply + jumper cables. 0-30V 0-2A Adjustable lab power supply kit, unassembled. A bunch of components I ordered from Comet Electronics.