help Need help connecting the arduino nano (A1), RTC module (CT1), SD card module (S1), LCD display (L1), and ultrasonic sensor (U1) together

 

Show us your best attempt at wire connections first. You said you need 'help', not do my work for me.

 

this is what I had

 

So what do you think is missing or is wrong? A quick look sees that VIN (and other connections on that bus) on the arduino nano pin 30 looks questionable.

VIN is the input of the onboard 5V voltage regulator.
https://docs.arduino.cc/resources/schematics/A000005-schematics.pdf

 

I'mreally not sure, I've not worked with a lot with these components. So I kind of wanted input on where I went wrong, if I did, with the wiring.

 

I'mreally not sure, I've not worked with a lot with these components. So I kind of wanted input on where I went wrong, if I did, with the wiring.

The way to learn is not for someone else to tell you. Look at the datasheet connections diagrams and schematics for each part, look at other similar projects. Understand what you want to do in detail and how it's possible. Have your worked with this type of controller before? If you haven't, then look for a simple blink LED example, then move forward, step by step to something like the LCD display next.

 

Where are all the power connections?
Also Use the proper GND symbol, unless it is actually an Earth Gnd connection !

 

View attachment 341842 help Need help connecting the arduino nano (A1), RTC module (CT1), SD card module (S1), LCD display (L1), and ultrasonic sensor (U1) together

Based on your description, the primary issue seems to be the power distribution and pin mapping rather than the code itself as you have mentioned.

The most critical mistake is using VIN as a 5V source. On an Arduino, VIN is for unregulated power input (7V-12V). If you are powering 5V modules, you must use the regulated 5V pin. another advice is to ensure you have a common ground across all modules, or the signals will be floating and inconsistent.

I'd also recommend sticking to the hardware-specific pins for your communication protocols:

• SPI (SD Card): Use pins 11, 12, and 13 (on an Uno).
• I2C (RTC/LCD): Use A4 (SDA) and A5 (SCL).

The best way to troubleshoot this is to test one module at a time. Get the RTC working first, then the SD card, and only then combine them. If you can post a photo of your current wiring or a simple schematic, we can help you spot any other potential shorts or misconfiguration

 

MOD NOTE: This homework thread died nearly a year ago. Let's let it rest in peace unless there's a really good reason to revive it.