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In reply to: PIC16F877A with DC Gear Motor
Hi,
About PULL UP or PULL DOWN resistors used along with Switches.
Switch is connected to an input pin of Microcontroller. A pin is in input state means that it is in HIGH IMPEDANCE state. So if you don’t connect any PULL UP or PULL DOWN resistors that pin will remains FLOATING when the switch is in OFF state. A floating pin may catch noises and reading such a pin will result in unexpected results. Its value usually varies erratically varies.
Programming Language
It is C.
Hi there, I have read through your tutorial about interfacing DC Motor with PIC Microcontroller using IC L293D and also how to enable the output by controlling the input of PIC with the use of LED light, the part I don’t understand is what is a pull up resistor you meant in the tutorial? The pull up resistor is connected to the switch.
I am currently doing a project which is a robot, when I turn on the switch, the robot will move forward direction, when it touches the wall, a sensor will be triggered and the motor will turn in another direction to move backwards. Any idea how the connection should be?
One last question, the code you posted is in what language please? Is it in C++ or?
Your help is very much appreciated, thanks.
Below is the tutorial links that I have question about:
https://electrosome.com/dc-motor-l293d-pic-microcontroller/
https://electrosome.com/push-button-switch-pic-microcontroller/
In reply to: Microcontroller pin in High Impedance State
You can make a pin of Microcontroller in High Impedance State by making it as an Input Pin. All input pins will be in High Impedance State.
In reply to: PIC Microcontroller Pin in High Impedance State
You can easily make an IO pin of PIC Microcontroller in High Impedance by making it an Input Pin. Just set the TRIS bit corresponding to the pin, it will make that pin High Impedance Input.
In reply to: RPM sensing using hall effect sensor
Using Interrupt with PIC Microcontroller – MikroC
Please read the datasheet of PIC 16F877A microcontroller… there you can find the procedure to use timer / counter module.
In reply to: RPM sensing using hall effect sensor
In reply to: PWM by pic 16F877A
For MPLAB you can use the following link.
Generating PWM with PIC Microcontroller – MPLAB Hi-Tech C
That code is working fine for me.
In reply to: PWM by pic 16F877A
MikroC libraries are working fine without any problem. Try the following link.
Topic: PWM by pic 16F877A
Hey guys,
I am using 16F877A to output PWM, increasing and decreasing it via two push buttons its based on the code used in DC Motor Speed Control using PWM with PIC Microcontroller in MikroC but the problem is that after a certain PWM value the PWM will not decrease and I have also added a switch with instantly makes duty value zero but it also doesn’t work after a certain pwm value and I have tried it on Proteus as well as with leds in real life but they give the same result. Only way it goes low is to keep pressing the UP button then some how it come down to a low value then other two switches start working and I then can switch it pwm off. Don’t know whats wrong.
Here is the code:-
{ adc = ADC_Read(1); // Get 10-bit results of AD conversion rpm_temp = adc * 2; //converting analog value to rpm WordToStr(rpm_temp, speed_out); //converting integer to string to disply on LCD Lcd_Out(2,9,speed_out);//Write speed in 2st row 6th col Delay_ms(100); if (RD0_bit ==0 && duty<250) //if button on RD0 pressed { Delay_ms(100); duty = duty + 10; //increment current_duty PWM1_Set_Duty(duty); //Change the duty cycle } if (RD1_bit ==0 && duty >0) //button on RD1 pressed { Delay_ms(100); duty = duty - 10; //decrement duty PWM1_Set_Duty(duty); } if (RD2_bit ==0 && duty >0) //button on RD2 pressed { Delay_ms(100); duty = 0; //reset duty PWM1_Set_Duty(duty); }In reply to: USART PIC16F877A
MikroC functions are 100% working..
You can use the following MPLAB XC8 tutorial to write your own functions.
In reply to: Soil Moisture Sensor
Are you talking about this Soil Moisture Sensor Module ?
It can be interfaced with microcontrollers using ADC or digital GPIO pins. Using analog method you can find the exact moisture content of soil. But if you are using digital output, you can detect when the moisture level crosses a particular level.
In reply to: Voltmeter Ammeter using PIC and PC
