Jump to content

thicks

Members
  • Gesamte Inhalte

    13
  • Benutzer seit

  • Letzter Besuch

thicks's Achievements

Newbie

Newbie (1/14)

0

Reputation in der Community

  1. Hi, What is the purpose of the Varistor in the Relay circuit. Is it to protect the chip and route current away if Voltage from Emitter to Collector is to high? Maybe it has something to do with the reverse leakage current from the photodiode array? Also, The Relay chip uses two MOSFETs. Is the second one used to isolate something or maybe its also related to the leakage current?
  2. Hi, I am just wonder about the capacitor and resistor that in front of the input of the ADC on the 0-20mA Current Loop bricklet. if I calculate the cutoff frequency I get 1592hz. Is there some noise that needs to be filtered around that frequency? Maybe it is not intended as an RC filter and the capacitor is filtering the ripple but the resistance is for some other purpose? Also, I notice that the ADC is grounded with the power source of the current loop device AGND. What would happen if the ADC chip was connected to the 3.3V power supply ground EP.
  3. Hi, I am trying to find the manufacturer part numbers for some of the components on the 0-20mA Bricklet. I downloaded the KiCad files and opened KiCad. When I open the "Eeschema" utility a message appears that says the Tinkerforge library could not be found. When I open the "CvPCB" utility some .mod files could not be found. How do I download the Tinkerforge library and .mod files need by KiCAD? How do I get a parts list of all the components on the board?
  4. I would like to replace the 91 ohm / 25 ppm shunt resistor on the Current Loop Bricklet with a Vishey Foil Resistor. I am looking for something with a lower TCR that could be easily swapped out. Maybe 5ppm or less. If it is not exactly 91 ohms then I will modify the Bricklet Firmware accordingly. Any suggestions?
  5. I might try the uCurrent. Thanks for the advice borg. I was able to set up a voltage divide circuit with a 1.2K Resistor and a 5K Potentiometer. I can adjust the potentiometer and see the current change between 4-20mA with "Brick Viewer". Is there an easy way to modify the 0-20mA bricklet firmware so that I could do the following: See more digits in "Brick Viewer" Change the resolution to 18bits on the MCP3423 ADC. Output just the raw Analog to Digital Converter data. I have the processes for modifying the Bricklet firmware working. I am hoping that I could be directed to the place in the code where I could make these modification. Also, is it possible that a Red Brick could help me with this? Any help would be appreciated.
  6. Hi, I am trying to accurately test the Industrial 0-20mA Bricklet for a 2 wire application. My application will be using 24VDC for excitation with a 0-20mA Pressure Transducer. (Pin 1 +24V Power Supply, Pin 2 0V Return to Power Supply, Pin 3 to Transducer Excitation, Pin 4 Signal from Transducer). To test the accuracy of the Bricklet, I was thinking of renting a Keithley 6220 Current Generator BUT I am not sure how I would wire thise into the bricklet. A Current loop Simulator might not be accurate enough. I am looking for an input source that will allow we to select current at 16 bits or 0.00061mA. If anyone has a good idea of how to accurately test the Bricklet then let me know. Please send wiring diagram of setup.
  7. I stand corrected. Sourcery CodeBench Lite 2014.05-28 is available and it worked. For a test, I did the following: Downloaded the Firmware Source for the master Brick 2.1 Erased the Firmware on the Master Brick. Built the .bin file and flashed it to the Master Brick I have a digital Input Bricklet attached and that still switched Hi and Low so I think all is well. Thanks for your help everyone!
  8. You might want to know that Sourcery CodeBench Lite is not longer available. This means that the article "Firmwares and Plugins" on Tinkerforge is out of date. I think my only option is to use the 30 day free trial. Any ideas? From Mentor Graphics site: Sourcery CodeBench Lite releases for ARM EABI, ARM GNU/Linux, ARM AARCH64-Linux, IA32/IA64 GNU/Linux and ELF are no longer available.
  9. Hi, Your comments have led me to this article "Firmwares and Plugins". The article describes the Brick Firmware and Bricklet Plugins. Any information out there on how to create the configuration and then generate the API Binding? I would like to access my bricklet using a binding for .NET to be used with C#, VB.NET and Labview. I see some generators on GitHub. Thanks for all your help Photron
  10. Hello, I have the Industrial 0-20ma Current Loop bricklet and I would like to have a Thermocouple bricklet. Has anyone created their own bricklet. I think you would need to store some identification data in the EEPROM of your bricklet. There is probably some type of a format for the information so that the Daemon can identify the bricklet. You would also need to modify the Master Brick code and the Daemon code so that your bricklet could be handled. Then you would need to modify the API so that you could communicate with the Bricklet in a .Net language or Labview. If this is a possibility then let me know everything about it.
  11. I updated the USB driver and it works! Thank You!
  12. I am attempting to see a Master Brick Tab in the Brick Viewer. Brick Daemon 2.2.1 and Brick View 2.2.2 are installed on a Windows 7 platform. I can see that the Brick Daemon is running as a Service with no errors showing in logviewer. I can connect Brick View to Brick Daemon but there is no Master Brick Tab. Master Brick setup. I have connect the USB cable from the Master Brick to my PC and I can see the brick in Device Manger. It shows up under device "libusb (WinUSB) Device" as "Tinkerforge Brick". Device Status: "This device is working properly". Location: Location 0 (Port_#0003.Hub_#0001). Version: 6.1.7600.16385 I have Internet Information Server enabled so the localhost is available. The port used between the Daemon and the Viewer is 4223 and I can see it using the netstat -a command. Perhaps this is a security issue on my PC. Can anyone tell me what I need to check for. Any help would be greatly appreciated.
×
×
  • Neu erstellen...