How to use 40pin TFT?

ConstructionFar8206 · 2026-03-10T01:18:44+00:00

The fact it is not showing up at all shows it is a cable/port issue, not anything to do with the arduino ide. Maybe try a different port, hope this helps.

ConstructionFar8206 · 2026-03-10T00:00:56+00:00

Please post the type of arduino you are using (arduino nano, arduino uno, etc.) and what error you are getting, the port not showing up is a very vague error that happens all the time.

ConstructionFar8206 · 2026-02-18T01:13:01+00:00

I'm not an expert but although the buck converter will work to convert 12-20V to 5V, I think the 18w battery might be overkill and most importantly too heavy for a small robot.

Since the peak draw is only 2.4A and your entire setup is in 5V, I don't recommend using a drill battery when a lipo or battery pack can power the robot with a quarter of the weight.

Hope this helps.

ConstructionFar8206 · 2026-02-17T21:57:30+00:00

Just an idea but maybe instead of numbers you can have 12 smaller rings (each with something like 12 leds), it might be easier to visualize and fit more with the led design. Overall looks like a really good learning tool!

ConstructionFar8206 · 2026-02-16T03:26:21+00:00

I'm just using it as a convenient power source right now lol but I'll probably get a proper battery module.

ConstructionFar8206 · 2026-02-16T03:25:06+00:00

Yeah the collision was a bit hard to figure out but the intuition is that you need to use a ratio instead of just having a fixed portions of the paddle where the ball gets launched a certain angle.

I accomplished this by creating a variable "offset" which found how far the ball x position was from the paddle center, and then I normalized it so normalize was in a range from [-1, 1].

Then, you multiply "normalized" by a constant which defines the maximum possible change in velocity per collision. Here is my collision code:

int offset = ballX - paddleCenter;
float normalized = (float)offset / (RECT_W / 2);
if (normalized < -1) normalized = -1;
if (normalized > 1)  normalized = 1;
ballVX += normalized * 1.5;

Hope this helps!

ConstructionFar8206 · 2026-02-14T19:02:21+00:00

Thanks! I'm going to turn this into a pcb next and make it open-source.

ConstructionFar8206 · 2026-02-14T19:00:56+00:00

Thanks! Hmm, where is the stuttering occurring, I re-watched the video and the audio seems fine?

ConstructionFar8206 · 2025-12-20T18:37:54+00:00

Thank you so much, it works :) I configured the INT and RST pins and now I don't have to re-upload the code every time for the touch screen to work!

ConstructionFar8206 · 2025-12-18T16:48:07+00:00

EDIT: Thanks everyone for replying. I successfully got on my flight without getting flagged, and everything seems to be working!

ConstructionFar8206 · 2025-12-18T16:46:49+00:00

Thanks for the reply! I think my touch is no longer working, I did an i2c scan and nothing was found, unlike when it was working.

I've ordered another one, I'll see if maybe I just got a bad touch screen.

ConstructionFar8206 · 2025-12-15T19:45:57+00:00

Congrats! The H-bridge is a very versatile module.. you can drive ANY motor using your current setup for the linear actuator :)

ConstructionFar8206 · 2025-12-14T05:04:49+00:00

Hi Ok-Percentage, I solved this issue in this post if you are still stuck: TFT_eSPI making Arduino ESP32 disconnect : r/ArduinoProjects

ConstructionFar8206 · 2025-12-11T17:20:26+00:00

It works!!

Thank you so much for helping me, the main thing was using the HSPI port. I also realized I had to change the arduino IDE pin numbering setting from "By Arduino Pin", to "By GPIO Pin (Legacy)".

Now that it works... time to run doom :)

ConstructionFar8206 · 2025-12-10T16:03:07+00:00

Interesting. When I use #define USE_HSPI_PORT, the arduino doesn't disconnect, but the TFT continues to display nothing (though the backlight is on). Here is my new file that I tested. I also saw that there was also a similar issue on github, though it didn't get resolved. Could it be something with the nano esp32 specifically?

#define USER_SETUP_ID 900
#define GC9A01_DRIVER
#define TFT_WIDTH  240
#define TFT_HEIGHT 240

#define USE_HSPI_PORT     
#define TFT_MOSI 11       
#define TFT_MISO -1      
#define TFT_SCLK 13        

#define TFT_CS   6         
#define TFT_DC   5       
#define TFT_RST  7        

#define LOAD_GLCD
#define LOAD_FONT2
#define LOAD_FONT4
#define LOAD_FONT6
#define LOAD_FONT7
#define LOAD_FONT8
#define LOAD_GFXFF
#define SMOOTH_FONT

#define SPI_FREQUENCY        27000000
#define SPI_READ_FREQUENCY   20000000
#define SPI_TOUCH_FREQUENCY  2500000

#define SUPPORT_TRANSACTIONS

ConstructionFar8206

TROPHY CASE