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DE and RE are on constant potential:
DE - 5V
_RE - 0V
I added resistors: 2x 120ohm to AB and 2x to ZY.
Still no transmission. Is the wiring diagram correct?
Why this is not RS485 but RS422?
Hi
I wrote simply program to send data from uC to PC. I use PIC UART and ft232. It works.
Now, I would like to transfer my weather measuring system from my room to the garden. USB does not work at such distances (20m). That's why I decided to use RS485. I think, the easiest solution is to use...
I use a measuring card designed by a no-name company. I got such measuring equipment at the university. I apologize for the lack of specifications. I only have this information:
"The differential input signal has a maximum positive value when input V+ is at +5 V and input V− is at −5 V. It has...
Hi,
I use a vibration sensor that generates a signal +-3V ( +-3V signal, AGnd). I want connect sensor to the differential ADC converter (V+ V- GND).
Is it possible to connect such a signal without any amplifier?
I have to questions:
1) Can I connect the signal in the following way: +-3V signal...
[Xmega] xboot change fusybits
Hi,
I am using bootloader "Xboot" for xmega. I always upload my .hex file by avrdude. I'm wondering, is there any way to change the processor fusebit using bootloader? Currently I have to do it with a AVR-ICE programator and it is not very convenient since I use...
To calculate noise u should know:
- typical noise of oamp and your badwith
- oamp gain
- resistors value
for example :)
for 1Mhz, and gain = 10, oamp noise hm,. f.e 10nV/√Hz, resistor 50 ohm,
rms noise for resistor is: 0.89970847 uV
http://www.sengpielaudio.com/calculator-noise.htm
your gian...
Thanks for response. I tried to use ad623 (monolit instrumental oampm single so8) and differential oamp with resistors 0.1%. I had similar errors in outputs. I need better precision. At the output i have:
Vmeasure | Vtheoreticall | error(Vm-Vt)
0.11 | -0,54 | -0,44 mV | 580% (!!)
3.84 | 5.04...
0-10V to 0-2.5, easiest way is to use voltage divider with buffer
+-10 to 0-2.5V, search information about differential to singel ended
or buy "black box" Universal Signal Conditioning Module
**broken link removed**
Hi,
I made simply simulation for difference op amp. In simulation I am using resistors: Rf=10k, Rg=1k, so gain is 10. When I change value of one resistor I have error on output. I know, this oamp is very sensitive to resistors tolerance. For example, in ideal world:
R1=1k, R2f=10k, R3=1k...
I think i know how to valid data. I check variable vstatus. For each channel I have a unique voltage divider. I think my problem is write correct adress for other channels (1-7). Channel 0 is working becouse i write data adress from datasheet. It seems to me that I made mistakes in the...
I think, I know that. To verify information i must check status register. I do it on vstatus variable.
My problem is problem to read correct voltage value from another channel. On each channel i have voltage divider, So I know the voltage value for each channel. My code works only for one...
Hi!
I wrote simply program to read data from Ad7739 (24bit adc) to atmega. My program works, but has one bug. Program is able to read data only from one channel. I cant read voltages from another channels. I think I do not understand datasheet becouse the SPI code works. It's probably a problem...
Hi :)
I dont understand application note of lt1964. In my board I need to using one atmega pin to turn off -5V stabilizer. The documentation says that:
Note 8: Positive SHDN pin current flows into the SHDN pin. SHDN pin current is included in the GND pin current specifi cation.
"SHDN: The...
Ymm,. the sensor has an output:
Output voltage differential [V] 0 ... 2.5 (@ high impedance load)
Output common mode voltage [V] 0
I have to convert the output voltage to asymmetrical signal (singel ended) . What does it mean? Apparently badly I understood it. Could I have a graph of signals...
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