LiquidCrystal_I2C | standard Arduino LCD library , configured to work
kandi X-RAY | LiquidCrystal_I2C Summary
kandi X-RAY | LiquidCrystal_I2C Summary
It is the reimplementation of the standard Arduino LCD library, configured to work with parallel HD44780 compatible LCDs, and interfaced via a Chinese PCF8574 I2C serial extender.
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LiquidCrystal_I2C Examples and Code Snippets
Community Discussions
Trending Discussions on LiquidCrystal_I2C
QUESTION
I am using an Arduino 2560, NEMA23 Stepper motor with a TB6600 driver. The driver is set to 1/32 step division. The motor by default is 200 steps per revolution.
I want to input step size, number of steps and settling time. Once the loop completes the number of steps i want to return to the starting point. The plan is to take multiple images and stack them in Photoshop.
So far everything works except for the return to starting point ...some of the time. If I don't step too far, meaning a combination of step size and number of steps, the motor returns to the starting point. If I exceed "X" distance the last step continues to move forward instead of backwards. I haven't fully tested what "X" distance is.
Example: If I use 5 steps with a step size of 5000 then the code returns to the starting point. If I change the steps to 7 and keep the step size at 5000 it does not return but moves forward.
Here is the complete code:
...ANSWER
Answered 2021-Mar-31 at 03:55Found the problem. Since stepSize and numSteps are integers the math flips any result over 32767 (16 bit). Anything over 32767 results in an overflow and is converted to a negative.
I now just need to set the stepper microsteps to a value that will allow enough travel and stay under the 32767 limitation.
QUESTION
I'm working on my college project on which I have to measure the temperature show it on 16x2 LCD and also to switch the cooling device according to the temperature, also I have to use pH Sensor and have to display its value on 16x2. Currently I'm using the code below for Temperature and switching, but it is not working properly. It shows the temperature on the screen but also some garbage value, and also not switching properly.
...ANSWER
Answered 2020-Nov-27 at 15:25I will divide my answer into two parts:
- Hardware:
Please describe your hardware configuration in order to narrow down your problem: How are you switching the relay? Is it optically coupled? Are you using a transistor? If so, what type? Does your relay have reverse diode protection? (Do not connect your relay directly to an Arduino pin)
- Code
2.1. This for-loop in your setup() is incorrect:
QUESTION
So I have been working with my Arduino to make a calculator, and thats what I did. Although, it did not work as I expected it to. When I input simple calculations, it spits it out fine, but when I put in complicated calculations, it goes berserk! It tells me that 9999 * 9 is about -14554 or something like that. Here is the code:
...ANSWER
Answered 2020-Nov-05 at 23:29This does look like an overflow on a 16-bit signed integer which is what the Arduino Uno uses internally. Numbers > 32767 cannot be represented with this. It's not an error, it's a limitation of that hardware, it's just 16-bit.
You need to use multiple int values in order to hold anything larger.
QUESTION
I have an LCD display attached to my Arduino Mega 2560 using the following code:
...ANSWER
Answered 2020-Sep-08 at 15:11Inside begin() method you define a local variable with the same name as your class field
QUESTION
I would like to compare two values z1 (CRC built from last two concatenated of outWord[10] and outWord[11]), and z2 that is also CRC but calculated upon packet numbers.
z1 is as it should be e568 and z2 too, but when I compare both values I got a difference.
Can you tell me please where the problem is?
...ANSWER
Answered 2020-Jul-10 at 13:49You can't compare the contents of two char* string by comparing their pointers, as in if (z1 == z2). This will (almost) always be false, as the strings are in two different memory locations, so their addresses will be different.
You should use the strcmp() function, which returns zero if the strings are the same. So:
QUESTION
I have two classes where the first one is instantiated in an object wich is used inside another object of class 'two'. The problem I have is when trying to access the members of the object of first class through the object of second class.
I'm using this approach on arduino to instantiate an object wich controls a LCD with LiquidCrystal_I2C class wich needs parameters as soon is instantiated.
Example code:
...ANSWER
Answered 2020-Mar-20 at 15:19I didn't inspect is all to well, but I encountered this error before.
In attachA you create a temp object and save its address.
This should not be done as the object gets destructed at the end of the method.
So you have an address to somewhere on the stack (because stack-local variable). On the invocation of the method on the other object, the stack frame is the same by (more or less) chance and the object resides in the same location.
So both addresses end up the same (and incidentally invalid).
QUESTION
I am trying to send a SMS using GSM SIM900A. But there is no compilation error and other interference there.
The code is executed properly but SMS isn't sent to the number mentioned in the code.
...ANSWER
Answered 2019-Nov-15 at 02:55GSM SIM900A only supports 2G SIM card.At first make sure that you are using a 2G SIM.
QUESTION
I am reading the output in voltage of a turbidity sensor : https://www.dfrobot.com/product-1394.html?tracking=5b603d54411d5 with an Arduino UNO. I want to print the value of volts outage and its NTU (turbidity units) on an LCD screen ADM1602U Sparkfun.
I cant seem to print the dtata correctly on the lCD, it opens and lights up (so I think the wiring is ok) but no data appear.
Here is the code I am using:
...ANSWER
Answered 2019-Sep-30 at 13:57Ok so I found the answer, the libary used was not appropriate to print on a 16x2 LCD display. The following code worked FYI:
QUESTION
How to dim the backlight on an 20x4 LCD Display with the i2c connected to an Arduino uno?
I use the LiquidCrystal_I2C.h library and I can turn on and of the light with
lcd.backlight();
and
lcd.noBacklight();
But I don't want to turn off completely the backlight: I want to dim it.
...ANSWER
Answered 2018-Mar-05 at 07:52Simple answer : You can't.
Complex Answer : You can use a BJT controlled by PWM to change/adapt the brightness.
QUESTION
When I run my code the Arduino IDE gives me the error:
exit status 1
'POSITIVE' was not declared in this scope.
Why is this happening, and how can I fix this?
Here is my full code: https://pastebin.com/yvDEZWd3
Here is the part of the code I am having issues with:
...ANSWER
Answered 2019-Jul-03 at 01:26You haven't defined/declared the POSITIVE variable. What's it supposed to be? Seems as though you want a define for it:
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