Search found 17 matches
- Sat Jun 06, 2020 5:56 pm
- Forum: Hardware
- Topic: DAC has a lot of offset
- Replies: 1
- Views: 2330
Re: DAC has a lot of offset
I wasn't able to find any suggestions on how to fix this, so I added a small positive bias voltage to the non-inverting input of my Op Amp signal conditioner. This fixed the problem, but at the expense of a new board revision, and some reduced dynamic range (zero volts out now starts at a DAC count ...
- Fri Jun 05, 2020 4:37 pm
- Forum: Hardware
- Topic: Which FTDI and jumper wire to buy
- Replies: 1
- Views: 3143
Re: Which FTDI and jumper wire to buy
No reason this shouldn’t work.
As for jumper wire - any small insulated wire will do. I bought a package of various multi-color jumpers with M-M, F-F, and M-F pins. Very handy.
As for jumper wire - any small insulated wire will do. I bought a package of various multi-color jumpers with M-M, F-F, and M-F pins. Very handy.
- Fri Jun 05, 2020 1:04 am
- Forum: Hardware
- Topic: PCB Antenna Tuning
- Replies: 4
- Views: 5419
Re: PCB Antenna Tuning
Look here: https://www.ti.com/lit/an/swra638/swra6 ... 1318797718
But, this going to be an approximation at best. Once you get close, you are going to need to make a board and actually measure it’s performance.
But, this going to be an approximation at best. Once you get close, you are going to need to make a board and actually measure it’s performance.
- Thu Jun 04, 2020 11:02 pm
- Forum: Hardware
- Topic: DAC has a lot of offset
- Replies: 1
- Views: 2330
DAC has a lot of offset
Has anyone else experienced this?
Both DAC channels have between 4 and 10mV of offset when they are supposed to be at zero volts.
This is a problem for me, since I really need the output to go to zero when it is supposed to.
Both DAC channels have between 4 and 10mV of offset when they are supposed to be at zero volts.
This is a problem for me, since I really need the output to go to zero when it is supposed to.
- Thu Jun 04, 2020 11:00 pm
- Forum: Hardware
- Topic: RS422 vs RS485 for newbie
- Replies: 1
- Views: 4412
Re: RS422 vs RS485 for newbie
I don't understand the question, but RS485 is a bus and RS422 is point-to-point.
Both are differential, but the protocols are generally much different.
A better diagram, and clearer explanation of what you are trying to do would help.
Both are differential, but the protocols are generally much different.
A better diagram, and clearer explanation of what you are trying to do would help.
- Mon Mar 04, 2019 3:25 pm
- Forum: ESP32 Arduino
- Topic: [SOLVED] void loop() doesn't detect button release ?
- Replies: 6
- Views: 8363
Re: void loop() doesn't detect button release ?
You need to loop while the button is pressed, and wait for it to be released.
- Fri Mar 01, 2019 3:09 am
- Forum: ESP32 Arduino
- Topic: How do I modify the uart ISR?
- Replies: 0
- Views: 2093
How do I modify the uart ISR?
I have some very tight serial timing requirements. Once I receive a command byte, I need to respond within 2mS. By setting the FIFO Full level to 1, I am able to do this most of the time, but there are still occasional delays that cause the response time to exceed my requirements. I would like to mo...