7
votes
Accepted
Custom arduino board
I have a page about a breadboard Arduino which is basically an Atmega328P processor (same as in the Uno, inter alia) on a breadboard.
Also a wire-wrapped Arduino.
You can go pretty minimalistic with ...
- 37.9k
5
votes
Accepted
SD card fails to initialize
The first thing to try is to use the 'proper' pins for the SPI:
SCK to Pin 10 on Arduino ---> Pin 13
CS to Pin 11 on Arduino ---> Pin 10
MISO to Pin 12 on Arduino ---> Pin 12
MOSI to Pin 13 ...
- 78
5
votes
Accepted
What is this shield? (AST Space Arduino Kit)
My name is Bing Zhu. I the host of ASTSpace a community open lab sponsored by Zhejiang Association for Science and Technology(ZAST). AST is situated inside the Zhejiang Museum of Science and ...
- 66
5
votes
Accepted
How to measure resistance of TFT Touchscreen
As pointed out in other answers and comments, step one was trying to get a datasheet for this component. I couldn't find a datasheet for the shield, but here is the link from the vendor I bought it ...
- 326
5
votes
Is there an alternative to soldering to connect boards?
Yes, there are ways. There is a system called "Press Fit" where the pins have a bulge in one end of them. This grips the inside of the holes in place of soldering.
A number of companies make them, ...
- 105k
4
votes
Accepted
Shield board with holes, do I need to solder?
Since there are two grounds, a 2-pin terminal block of the type already on the board may fit. Or, since the shield doesn't obscure the far end of the Mega (the end with the high numbered I/Os), you ...
- 15.1k
4
votes
Are there any advantages to Wifi shields as opposed to a Yun?
There's a number of things to consider that could sway your choice one way or another:
Power consumption
The Uno is a small low-power chip to which you add WiFi. The Yun is an Arduino Leonardo with ...
- 105k
4
votes
Accepted
Trying to make a wattmeter
You will need an Ampere meter and a Voltmeter. Watts is Volt * Ampere.
There are logic level compatible units out there for ampere meters ranging from a few mA to at least dozens of Amperes.
Also ...
- 347
4
votes
Accepted
What are the unused pins in an Arduino L293D motor shield?
Check out this Link. Here, you can find this explanation in Code. I hope it will helpful for you.
Pin usage with the Motorshield
---------------------------------------
Analog pins: not used at all......
- 1,476
4
votes
Accepted
Compatibility between shields
Its not just a question of the stackability of the shields and the clash of pins you also need to consider what the shields do.
Stacking the GSM shield under the LCD is going to restrict is tx/rx ...
- 5,637
4
votes
Accepted
How can I know if I can stack some shield on another shield?
First you have to compare the pinouts of the two shields. If the shields use completely different pins then yes, you can use them together.
However if they share pins then you need to look in more ...
- 105k
4
votes
Accepted
Connecting CAT5 robustly between portable Arduino and more portable sensors
Certainly go for RJ45 sockets. Not only does it help protect the wire, but it gives you a really easy way of swapping the wire for different lengths should you want to.
You can't solder an RJ45 ...
- 105k
4
votes
Can you help me trim my code?
The documentation for the MCUFRIEND_kbv project has a file describing how to use.
This document has the statement:
Most of these controllers are #define SUPPORT_xxxx by default.
You can save Flash ...
- 6,974
4
votes
Accepted
Can I use LiFe PO4 batteries in a 18650 battery shield?
In my opinion it is NOT SAFE, if your 18650 Battery Shield also charges the battery.
Anyhow some pages state that it is possible to charge LiFePo4 batteries with 4.2V instead of the recommended 3.65V. ...
- 1,513
4
votes
Need some Hardware advice with arduino
To process incoming images, voice commands, produce sounds, and also do WiFi is almost certainly beyond the capabilities of any micro computer, like the Arduino (maybe some of the more recent models ...
- 37.9k
3
votes
Accepted
What options are available for connecting to a CDMA network?
There are no CDMA (more correctly known as CDMA2000) modules for hobby projects. There are a lot of reasons for this, which I won't get into, but suffice it to say, it is the way it is.
EDIT
Okay, I'...
- 1,099
3
votes
H-Bridge L298N motor driver
You can try to bisect the problem.
Remove the Arduino and drive the motors with wires: replace the input for the pwm signal with a +Vcc and you will get the same as if the Arduino was outputting a ...
- 2,125
3
votes
Disconnect Ethernet Shield
You have correctly determined the root of the problem, both shields are trying to use the same pins. To work around this we need to know which pins are being used, and for what.
The Ethernet Shield ...
- 31
3
votes
Custom arduino board
Absolutely. You might start with the Arduino to Breadboard Tutorial while defining your hardware requirement - for example, decide what voltage you are going to run at (and pick an appropriate ...
- 5,390
3
votes
Accepted
Arduino uno + cnc shield v3 + Stepper Motor Driver A4988 + AccelStepper?
Manually set the ENABLE pins as OUTPUTs, i.e. add in the setup() function:
pinMode(MOTOR_A_ENABLE_PIN, OUTPUT);
pinMode(MOTOR_B_ENABLE_PIN, OUTPUT);
3
votes
What Arduino board with WiFi should I choose
I'd recommend ESP8266 (model 07) based board.
Can be programmed the same way as other Arduinos
Cheap
Enough storage for code
Fairly low power
Large community (more code examples and better library ...
- 624
3
votes
Accepted
What happens if I try to draw power from the VIN port while under USB power on an Uno?
You do run the risk of damaging the 5V regulator, yes.
Power will attempt to flow from the 5V rail (USB port) through the voltage regulator (backwards) and into the shield to power it.
As your ...
- 105k
3
votes
Accepted
Arduino GPRS (GSM) shield (SIM900) no long pins
Yes, you can.
There is two methods of making shields stackable:
Use the quite hard to source extra long pinned headers to go right through and down (such as these https://www.adafruit.com/products/...
- 105k
3
votes
Who makes this cool Arduino display shield, and what model is it?
That will be an SSD1306 based blue OLED display with SPI interface. There's lots of them around by lots of different people. Some are I2C interface, and some of those have a "broken" I2C interface ...
- 105k
3
votes
Following on ESP8266 Board pins, how do they map on the motor shield?
You see the pins marked PWMA, PWMB, DA and DB? Those are the pins that control the motors (PWMx is the speed, Dx is the direction). Whatever pins on your ESP8266 board plug into those holes are the ...
- 105k
3
votes
Accepted
USB DEVICES WITH THE 32U4?
Some important facts:
The 32U4 cannot act as a USB master, only a USB device (it doesn't have a USB OTG interface).
The USB shield is an SPI based device. It can communicate with any host MCU that ...
- 105k
3
votes
Accepted
Arduino Mega vs servo shield
The idea of that particular servo shield is that it provides 16 PWM (pulse width modulation) channels. These are all operated simultaneously with no additional processing overhead on the Arduino.
...
- 459
3
votes
Accepted
Do all arducam need the "Arducam-F Shield"?
You have three requirements:
Good quality (colour)
High resolution
Fast operation
Those three requirements together mean you cannot use a normal Arduino.
The Arduino has nether the memory nor ...
- 105k
3
votes
mcufriend 2.4 TFT with ESP8266
You have an 8-bit parallel interface TFT display. It requires 13 GPIO pins - D0-D7 plus reset, chip select, read, write and register select. You can forego the "read" signal and tie it high to save a ...
- 105k
3
votes
mcufriend 2.4 TFT with ESP8266
SD_DI is the MOSI, and SD_DO is the MISO. According to the datasheet.
- 31
Only top scored, non community-wiki answers of a minimum length are eligible