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First question: where are EEPROM_WRITE_ID and EEPROM_READ_ID defined?
Second question: have you used a scope or logic analyzer to determine if the write and/or read are working? ie., is the eeprom sending acks back?
If you do not already have a scope or logic analyzer and you plan on writing...
I have a simple mcu-based circuit board that turns on and off 12V mechanical relays. The board requires 12V DC to operate which goes through a 5V regulator to the mcu and the rest of the circuit. There are 10uF tantalum caps on both the 12V signal coming into regulator and the 5V DC going out...
Hi Brian - I greatly appreciate your response. I don't think this is the problem though as the board is laid out with a connector that only provides access to the 2 "load' connections on the SS relay. The connection to the LED on the relay is from the mcu output pin with a 5.1K resistor so...
Long story short - I am using a small solid state relay (Clare CPC1017N - see attached) to mimic pressing a switch on another board. The voltage being switched is only 3V and I am sure it is very low current so I am confident that I am within the specs of the relay. They also spec 1mA to turn...
So here is what I did to ultimately solve this. The incoming signal is connected to the gate of a 2N7002 Mosfet. This gives me protection for incoming signals up to 12V (actually much higher than that) and it has a max threshold of 2.5V. I connect the drain to 5V and source to ground through a...
So I got a TL331 comparator and it works great....except that after seeing odd behavior with higher input voltages I dug into the datasheet more closely and see that this device also brackets your input voltage essentially between ground and Vdd. So I cannot use this solution because I want the...
Actually the bulk of the comparators that I found do not support such a wide input range but I did find some. I have ordered some TL331 devices from TI so I will let you know if this works - thanks.
I need help. I have a board with a MCU that has an input coming from off the board from a number of possible sources so the incoming signal will vary. Here is what I am trying to accomplish:
1) The input signal will be a DC voltage ranging from 0V up to 15V.
2) Any signal above about 3V...
I want to design a "trigger" input into the pin of a microcontroller that is running at 5V. However, the input voltage of the trigger for a "high" could be 5V or 12V. Can I just tie the input to the base of a transistor and use it to turn on or off a 5V signal to the actual pin on the...
I cannot tell for sure but it appears that you are driving the data line high during the read - you need to change the data direction bit during the read so the slave device can pull the the data low when it needs to. In fact you should set the data bit low and then toggle the data direction...
problems with phase control of a lamp
Hi - I am creating a lamp dimmer using a micro to do phase control. There are 2 issues that I am having problems understanding. I want isolation from mains to my micro so I am using an ILD620 as a zero cross detect. I am using a 50K resistor in series...
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