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Cake day: June 11th, 2023

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  • That display can run a maximum SPI clock speed of 15MHz. That’s enough to update the full screen about 45 times a second when using RGB565 mode. If you are using an ATmega based Arduino, it’s probably the CPU that’s limiting your speed. Color graphics take a lot of processing power. Just make sure you’re using hardware SPI and that the SPI clock is set as high as it will go without going over 15MHz.



  • The GPU won’t have any issues encoding several video streams at the same time. That’s not really necessary though. The cameras will do the encoding for you. Just set the bitrate and framerate that you want on the camera and pass that through. Most cameras support two streams, the secondary stream is usually limited to SD though. All of my Hikvision cameras support RTSP. It’s mostly just the consumer grade crap that only works with the manufacturers cloud service so they can spy on you or restrict features whenever they want.

    Don’t make the mistake I did and buy any Hikivision stuff from Amazon. They are all grey market and the firmware can’t be updated. I tried to update one of mine and now the user interface is stuck in Chinese. You have to get them from an authorized distributor.










  • Those use a lithium ion cell, so they have a buck converter to step the voltage down to 1.5V, which will always use some power. They are not suitable low draw devices because of the high self discharge rate. They can’t be used in high draw devices because the buck converter can only supply a limited amount of current. They also produce noisy power which can cause issues with radios and audio equipment. The USB port and charge circuitry take up a lot of space, so you get less capacity too. A low self discharge NiMH cell will be better for almost any use.