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Yes indeed. But I checked the markings on the resistors. It shows as 102 (1 K) on both the modules.
Two 1K and One 4.7K are in parallel.
VCC is +3.30V (PIC and all i2c devices), Thermal Printer 12V/2A TTL serial interface from the PIC MCU.
So, for safer side it is better to remove the 1K...
Hi,
I am accessing 3 i2c devices from my PIC MCU.
I2C devices are:
1. EEPROM
2. PCF8574T Module 1
3. PCF8574T Module 2
I pulled up the SCL and SDA line of the EEPROM to VCC through 4K7 resistor. The 2 modules of PCF8574T (bought from online store) have their own pull up resistors of the value...
I have converted my char to uint16_t in the new code. Also EEPROM variable declared inside the function as you told. Initially I didn't change the EEPROM variable from "unsigned char" to uint since it was a trial and I am only giving starting EEPROM address 0x00. But after successful result...
Hi,
Actually I was trying to print bitmap image (monochrome bmp file) on Thermal Printer RP203 (TTL interface) from PIC16F1938. Since no memory available on PIC MCU to store huge data, I have used EEPROM to store the image file.
Procedure to prepare image before writing in to EEPROM:
1. Select...
Hi,
I found that the maximum variable length is 80. If I go beyond, strange things are happenning. So, I set the maximum length is 80 and read in 45 steps (32 bytes per page) using "for loop". Now everything works fine. I can store the bitmap data in to the AT24C32 EEPROM and Read back and print...
Hi all,
I am facing trouble in reading AT24C32 EEPROM from PIC MCU over I2C.
EEPROM : AT24C32
PIC MCU: PIC16F1938
I2C Module Interface
IDE: MPLAB V8.60
COMPILER : HI TECH C
The code is as follows:
unsigned char EEPROM_ADDR;
unsigned long chrData[300];
void ReadXTEEPROM(void){
unsigned long...
Hi all,
I finally abled to print bitmap image using the command
GS v 0 xL xH yL yH
Now the image prints on left justification. I need to be centered it. So I tried the command
ESC a 1
(0x1B 61 0x31)
But not succeeded. Any suggestion would be appreciated. Advance thanks.
Files added...
Really I did extensive search on the internet for last 3 days to get suitable ESC/POS command set for example downloaded command set from EPSON site and other sources. But commands are different for different models. Even i tried all the command set but i can't succeeded. For your information, I...
Dear friends,
I am able to print texts, barcodes on the (Serial/TTL) Thermal Printer from the PIC MCU using the following similar commands.
putch(0x1B); // ESC
putch(0x2A); //*
puts("Welcome to Edaboard \r\n");
etc.
but struggling to print the bitmap. I like to bring one important point to...
Thank you all for your suggestions.
As AudioGuru and danadakk said, I could not able to jam the mic using LM386 module.
But I can jam the microphone of the mobile phone successfully using using CA-3110 audio amplifier module.
The distance between the microphone and the ultrasonic transducer...
I didn't design the circuit. Just i bought from the amazon.
As i already said, it was taken out from the commonly available ultrasonic module HC-SRO4. No details available about the transducer except it resonates at 40khz range.
To other seniors FVM, KlausST AUDIOGURU & dick_freebird:
The...
Hi,
Purpose : to drive ultrasonic transducer at 40kHz
Parts used:
1. Ultrasonic Transducer (taken out from general module from HC-SRO4)
2. PWM generator module with led display (micro usb 2 channel pwm generator with led)
3. LM386 amplifier module
4. +5v/500mA for PWM module
5. +9V/7AH...
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