Table of Contents
- 1 What sequence of the steps are correct for sending data to an LCD?
- 2 What sequence of the steps are correct for sending data to an LCD 1 clear the R W bit 2 send data on Do d7 pins 3 set the e bit 4 set the RS bit?
- 3 What is the 0x06 command?
- 4 Which of the following steps detects the key in a 4 * 4 keyboard matrix about the key that is being pressed?
- 5 What are the 4 commands used for interfacing?
- 6 What are the actual steps that are followed in identifying any key that is being pressed?
- 7 What are steps in LCD initializing?
- 8 How a microcontroller identifies the key press?
What sequence of the steps are correct for sending data to an LCD?
Explanation: To send data to an LCD, RS pin should be set so that LCD will come to know that it will receive data which has to display on the screen. R/W pin should be reset as data has to be displayed (i.e. write to the LCD). High to low pulse must be applied to the E pin when data is supplied to data pins of the LCD.
What sequence of the steps are correct for sending data to an LCD 1 clear the R W bit 2 send data on Do d7 pins 3 set the e bit 4 set the RS bit?
Steps for Sending Command: step1: Send the I/P command to LCD. step2: Select the Control Register by making RS low. step3: Select Write operation making RW low. step4: Send a High-to-Low pulse on Enable PIN with some delay_us.
What steps have to be followed for interfacing a sensor to a micro controller 8051?
For interfacing a sensor with 8051 micro controller, firstly it need to be converted into a digital value by connecting it to an ADC converter. Then this digital value is to be send to the micro controller. Now micro controller can examine the results according to the program inbuilt in it.
What is the 0x06 command?
The command 0x06 is entry mode it tells the lcd that we are going to use. The command 0x08 dispalys cursor off and display off but with out clearing DDRAM contents. The command 0x0E displays cursor on and dispaly on.
Which of the following steps detects the key in a 4 * 4 keyboard matrix about the key that is being pressed?
Discussion Forum
| Que. | Which of the following steps detects the key in a 4*4 keyboard matrix about the key that is being pressed? |
|---|---|
| b. | ensuring that initially all keys are open |
| c. | checking that whether the key is actually pressed or not |
| d. | all of the mentioned |
| Answer:all of the mentioned |
What is the correct order of priority that is set after a controller gets reset?
What is the correct order of priority that is set after a controller gets reset? Solution: EX0 >T0 > EX1> T1>TxD/RxD. This is the correct order of priority that is set after a controller gets reset.
What are the 4 commands used for interfacing?
Command write function
- First, send a Higher nibble of command.
- Make RS pin low, RS=0 (command reg.)
- Make RW pin low, RW=0 (write operation) or connect it to ground.
- Give High to Low pulse at Enable (E).
- Send lower nibble of command.
- Give High to Low pulse at Enable (E).
What are the actual steps that are followed in identifying any key that is being pressed?
Explanation: In order to identify that which key is actually pressed form a particular format of a 3*3 matrix keyboard, we firstly ensure all initially all the keys are open, then we press a key and check that whether the key is actually pressed or not by waiting for a time span of 20mseconds, after this we identify …
What is LCD command?
A command is an instruction given to LCD to do a predefined task. Examples like: initializing it. clearing its screen. setting the cursor position.
What are steps in LCD initializing?
As you can see from the flow chart, the LCD is initialized in the following sequence…
- Send command 0x30 – Using 8-bit interface.
- Delay 20ms.
- Send command 0x30 – 8-bit interface.
- Delay 20ms.
- Send command 0x30 – 8-bit interface.
- Delay 20ms.
- Send Function set – see Table 4 for more information.
- Display Clear command.
How a microcontroller identifies the key press?
For detecting the pressed key, the microcontroller grounds all rows by providing 0 to the input latch, and then it reads columns. If the data read from the columns is D3-D0=1111, no key has been pressed and the process continues until a key pressed is detected by system.
Which are the steps to detect a keypress using a keypad?
Pseudocode
- Scan a row of keys to see if any are pressed.
- If a key is pressed, perform software key debouncing: Wait a short period of time to allow key to settle. Confirm key is still pressed (Original keypress is not just noise). If key is still pressed, input is valid.
- Repeat step 1 with the next row of keys.