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martinberlin / H-cinread-it8951

CINWRITE pcb is the Hardware repository for the HAT that provides GoodDisplay DEXA-C097 controller a fast way to talk SPI and 5V boost converter. The goal of this HAT is to provide WiFi, Bluetooth, RTC and extra I2C connector for sensors
https://www.tindie.com/stores/fasani
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What is the power consumption of IT8951? #5

Open lanistor opened 1 year ago

lanistor commented 1 year ago

In some forums, I saw that the IT8951 consumes a lot of power and cannot be powered off.

martinberlin commented 1 year ago

It's not really on the documentation since I guess depends what display drives. Yes of you can power it off, please check this PCB, that I use to drive it. After all updates the 5V power goes down completely. There is a spike at the beginning when the 5V boost converter starts and then consumes between 150 and 200 ms while it's delivering the update. My PCB's will for some time discounted at https://lectronz.com/stores/fasani but the Cinread DEXA module you need to get it via Good Display ( freddie@good-display.com )

Tell him that I referenced you to get a better price.

gooddisplayepaper commented 1 year ago

Hello Lanistor, it's Freddie. Yes Martin's right I could give you a very very nice price about the DEXA board. We will find time to get the consumption value for you updated here as well.

gooddisplayepaper commented 1 year ago

https://twitter.com/i/status/1615548322567319558 Here this video for you see testing points readings.

lanistor commented 1 year ago

@martinberlin @gooddisplayepaper Thanks a lot, we are considering this solution, but we are worried about the performance of ESP32-S3, we are using ESP32 now but it computed slowly with lvgl(issue), we don't know if this will happen on current solution.

martinberlin commented 1 year ago

Get one and give it a try. @gooddisplayepaper could you sent one of your Cinwrite boards to them if they finish the purchase so it arrives faster? (I will restock it to you in next sending) @lanistor note that if they send it faster from there you have to soldier female headers. I usually do it this way:

Add female headers on the HAT. Put the male 2.54 headers looking up over the DEXA board and then turn it around to soldier. This makes that both PCB's are connected gracefully and without force. Please note: Only SPI pins and 5V + GND should be connected, leave I2C disconnected, since we don't use I2C communication with DEXA (All SPI master) SPI master works very fast with S3 and partial updates using Lovyan GFX library also worked good for us.

This is the most easy and efficient way, without wires all around, to test both boards together. It also leaves DEXA close to table level to connect the epaper panel. Check here the update speed reading an XML for my fork of the ESP32 Epub reader project https://fasani.de/2023/01/18/new-cases-for-the-9-7-parallel-displays-and-proposal-for-clb-club

lanistor commented 1 year ago

Full screen refresh nearly 2 seconds, it's OK. Thanks @martinberlin

@gooddisplayepaper May you send me a Cinwrite board, it can save our development time, thanks so much.