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IO Pin state during under voltage conditions
Assume I am driving Atmega328P from battery and I have set one of the port pins to HIGH. Now battery drains and voltage goes below safe operating conditions and processor goes to...
Fri. Nov 30, 2018 - 02:52 PM
Servo motor swing is only 90 degree
I have SG90 servo motor purchased from ebay.com. I wrote below code, but I am able to get swing of 90 degree instead of 180 degree. I verified that servo is of 180 degree by...
Wed. Oct 31, 2018 - 03:22 PM
false triggering issue with PB5 in Arduino Nano
I am using arduino nano (CH340 based china make) for some hobby project. I used PB5 for keypad as shown in the schematic. But the problem is that when I press button 1 sometimes I...
Fri. Jul 20, 2018 - 04:19 PM
Initializing Array of Pointers
I was looking one question in Stackoverflow here. Answers are inconclusive it looks and thought expert opinion from this forum.   OP asks if array of pointers can be...
Tue. Jun 26, 2018 - 06:04 PM
Data integrity while interfacing HC-05 bluetooth module
I am planning to interface HC-05 module to Atmega328P. I have uC1 --> Bluetooth Module1 --> Bluetooth Module2 --> uC2. Simple commands work fine and no issues. Suppose if...
Thu. Jun 14, 2018 - 09:16 AM
Issue in timer based delay program
I was working on simple timer based delay (just to understand the concept). I am trying to pulse PD3 every 50 msec. But in the below program, pulsing happens only until...
Sat. May 5, 2018 - 02:26 PM
Flash memory size usage with const
I have some doubt about the program memory usage in three cases given below. In first case, const keyword is not used. In this case program memory size is not getting increased....
Sun. Apr 29, 2018 - 05:28 PM
Configuring EICR after sei() changes the behavior
I was working on external interrupt. The code below works fine and LED toggles at the rate of 3000 msec ON time and 500 msec OFF time. But if  EICRA|=((1<<ISC00)|(...
Sat. Apr 14, 2018 - 02:10 PM
Detecting I2C LCD address automatically
Based on part number of PCF8574 , there are two default addresses possible for PCF8574 based serial module such as 0x7E or 0x4E. So I thought of detecting the address...
Sat. Mar 3, 2018 - 04:04 PM
Sharing IO ports for Keypad and LCD Display
I have IO pin scarcity. Thinking of sharing IO ports PC0 to PC3 between JHD162A based LCD display data lines and Keypad in Atmega328P-AU. Attached is the schematic (Only outline...
Mon. Feb 26, 2018 - 08:45 AM
Generic read switch function based on Active High/Low configuration
Sorry, this could be a silly question in this forum. But not able to find easy method. I would like to configure my switch input type as either active high or active low. I need a...
Sun. Feb 18, 2018 - 11:36 AM
code size of single liner set/reset bits operation is more than the separate set/reset operations
In the two operations below, I observed that the code size of single line operation on setting and clearing bits on DDRB is more than the operation made in two lines. I could not...
Thu. Feb 15, 2018 - 06:21 AM

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