1. LCD Not Initializing Q: My LCD shows nothing or random characters. A: Verify LCD_Init() was called first Check power supply (4.7V-5.5V recommended) Confirm contrast potentiometer is adjusted For I2C LCDs: Ensure correct I2C address 2. Missing Characters/Garbled Text Q: Some characters don’t display or appear corrupted. A: Check all data connections (D4-D7 for 4-bit mode) Add 100ms delay after LCD_Command(LCD_CLEAR) Verify RS and EN signal timing 3. Cursor Position Issues Q: Text appears at […]
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Here’s the optimized FAQ for your PCF8591 library in the requested format: 1. No Communication (ACK Not Received) Q: My PCF8591 doesn’t respond to I2C commands. A: Verify PCF8591_Init() was called first Check device address (default 0x48, configurable via A0-A2 pins) Ensure 4.7kΩ pull-up resistors on SDA/SCL Confirm power supply (2.5V-6V) is stable 2. ADC Reading Issues Q: ADC always returns 0 or 255. A: Check AREF pin has proper voltage reference Verify input voltage […]
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1. No Communication (ACK Not Received) Q: My device doesn’t respond to addresses. A: Verify I2C_Init() was called first Check pull-up resistors (4.7kΩ on SDA/SCL) Confirm slave address matches datasheet (7-bit vs 8-bit) Use logic analyzer to check signal integrity 2. Signal Glitches Q: Random NACKs or corrupted data. A: Add small delays (_nop_()) between SCL/SDA transitions Ensure power supply is stable (>100mA for bus) Keep I2C traces short (<30cm) 3. Clock Stretching Issues Q: Master hangs waiting for slave. […]
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