Search found 116 matches

by david.prentice
Sat Feb 03, 2018 6:15 pm
Forum: General discussion
Topic: How many fps can I expect if I use a 128x64 display and a blue pill?
Replies: 21
Views: 330

Re: How many fps can I expect if I use a 128x64 display and a blue pill?

Surely a regular reflective LCD is the best compromise for sunlight. i.e. traditional green background, black graphics. At night the backlight comes on. Personally, I don't like the Blue transmissive LCD with White graphics. Colour TFTs certainly look very smart in the ideal lighting conditions. Is ...
by david.prentice
Sat Feb 03, 2018 1:54 pm
Forum: General discussion
Topic: How many fps can I expect if I use a 128x64 display and a blue pill?
Replies: 21
Views: 330

Re: How many fps can I expect if I use a 128x64 display and a blue pill?

I am guessing that the RPM units might change over a one second period e.g. 11xxx. So you would update several times in a second. I doubt if the thousands change so often. From a human's point of view you want to see clear digits. You don't want a blur of changing units. The 60C and 234kph do not ch...
by david.prentice
Fri Feb 02, 2018 10:25 pm
Forum: General discussion
Topic: How many fps can I expect if I use a 128x64 display and a blue pill?
Replies: 21
Views: 330

Re: How many fps can I expect if I use a 128x64 display and a blue pill?

With all the wires in the photo, it must be 8-bit parallel. Only 1024 bytes to blit per frame. SPI or parallel does not matter too much. So you should be able to produce a fast frame rate. Just look at the minimum write cycle time for the controller. The real question is: what does the LCD look like...
by david.prentice
Sat Jan 20, 2018 8:29 pm
Forum: Hardware
Topic: 16 BIT HX8357C
Replies: 23
Views: 303

Re: 16 BIT HX8357C

The RD pin should be 3.3V when not active.

Personally, I always read ID, registers, GRAM memory ...
When you get your screen going, please could you read the ID for me.

David
by david.prentice
Tue Oct 10, 2017 8:56 am
Forum: Libraries & Hardware
Topic: Is anyone interested in helping to make an Arduino Due which uses [edited:] a 100-pin STM32L471
Replies: 92
Views: 3025

Re: Is anyone interested in helping to make an Arduino Due which uses [edited: a 100-pin STM32L471]

I had assumed you were in US or Europe. Nucleo boards take 24 hours to arrive from our local distributors. Compared with Due clones or STM32 BluePill taking 10-40 days from China. You know what the Chinese and Taiwan local markets are like. The US / European hobbyist will pay more for hardware. But ...
by david.prentice
Mon Oct 09, 2017 7:46 am
Forum: Libraries & Hardware
Topic: Is anyone interested in helping to make an Arduino Due which uses [edited:] a 100-pin STM32L471
Replies: 92
Views: 3025

Re: Is anyone interested in helping to make an Arduino Due which uses [edited: a 100-pin STM32L471]

Surely you can compare different STM32 chips by buying the relevant Nucleo or Discovery boards. You are either going to aim for lowest cost or best performance. In practice, you settle on a reasonable compromise. Personally, I like to have Arduino headers and accessible male pins. The Nucleo-64 and ...
by david.prentice
Thu Sep 28, 2017 9:26 am
Forum: Libraries & Hardware
Topic: Is anyone interested in helping to make an Arduino Due which uses [edited:] a 100-pin STM32L471
Replies: 92
Views: 3025

Re: Is anyone interested in helping to make an Arduino Due which uses a 100-pin STM32F072?

The F103 is a fairly elderly M3 chip. Its only redeeming feature is that Chinese BluePills and MapleMinis are very cheap. It has been succeeded by much better M3 and M4 chips If you want a Due replacement, you would be looking at a Cortex-M3 or M4 chip with similar number of pins to the elderly SAM3...
by david.prentice
Thu Aug 31, 2017 1:08 pm
Forum: Libary request
Topic: ili9225
Replies: 11
Views: 733

Re: ili9225

No, the ILI9225 is very different to the ILI9341. It is closer to the ILI9325 i.e. registers with 16-bit data. I think that the current Release of MCUFRIEND_kbv supports the ILI9225 in parallel mode. The Beta certainly does. I have an unpublished ILI9225_kbv which uses SPI interface. Please post a l...
by david.prentice
Tue Aug 29, 2017 9:45 pm
Forum: Hardware
Topic: anyone know if this lcd is ili9341 ?
Replies: 6
Views: 220

Re: anyone know if this lcd is ili9341 ?

this is the beastie from aliexpress keli store https://www.aliexpress.com/store/623118?spm=2114.10010108.0.0.4b24ae2bDGPvlj this is the beastie https://www.aliexpress.com/item-img/Free-Shipping-1pcs-lot-3-2-TFT-LCD-Module-Display-Touch-Screen-Panel-PCB-Adapter-Blue/2035710780.html?spm=2114.10010108...
by david.prentice
Sat Aug 12, 2017 10:36 pm
Forum: Hardware
Topic: A look inside the DS3231 RTC
Replies: 9
Views: 691

Re: A look inside the DS3231 RTC

Surely you can synchronise a clock to a GPS signal over a time period. And get an accurate time with averaging. There is no need to wait for a year. You can measure any phase difference between the DS3231 pulse output and the synchronised "accurate" clock. A 1 second error in 365 days is 0.03 ppm. Y...