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Recent content by mojo-chan

  1. M

    Pass-through UK socket enclosures

    I found one made by "International Configurations". Doesn't seem to be easily available though, probably a large MOQ. https://internationalconfig.com/icc6.asp?item=72165
  2. M

    Pass-through UK socket enclosures

    Does anyone know where I can get an exposure like this but for British mains sockets? Thanks.
  3. M

    Removing offset from ACS710 current sensor output

    Okay, I have a circuit that works in the simulator. This both scales (10.8x gain) and offsets the output to 1.89V, which I can work with. The output is inverted so voltage falls as current goes up. I am having trouble making it work with an LM321 but in theory it should be fine.
  4. M

    Removing offset from ACS710 current sensor output

    Thanks for the response. I have 3.3V, 5V and 12V available but can generate pretty much anything I need. Oh, and I have a precision 2.048V reference (LM4040) that I used as the analogue reference for the ADC, with a 1.024V bias voltage generated by a resistor divider. That is why the ADC can...
  5. M

    Removing offset from ACS710 current sensor output

    Hi. I am using an ACS710 hall effect sensor to measure current in a device for fully automated testing. The problem is that the ACS710 produces a 0-5V signal with 0A biased to 2.5V. My microcontroller can only measure 0-2V and I am only interested in positive currents, so what I need to do is...
  6. M

    Reflections on 1MHz serial bus

    Thanks Chuckey. I will try to disassemble the master device since the slave won't respond with the resistor removed. Having said that it might be pulled up and it would be interesting to see if it is pulled to 5V or 3.3V. Unfortunately I don't have any datasheets for the cabling, but there is a...
  7. M

    Reflections on 1MHz serial bus

    The peripheral I have to examine has a custom microcontroller of some kind connected to the bus like this: I was unable to measure the capacitor with my multimeters, probably off the scale. In fact I only think it is a capacitor because it is labelled C2 on the PCB, but I was wondering if it...
  8. M

    Reflections on 1MHz serial bus

    Thanks Goldsmith. The cable is coaxial. I have a peripheral that communicates with the embedded system I am trying to copy. I can emulate the embedded system okay, but I am having this problem emulating the peripheral. It isn't a big problem because it is clocked serial, so I can just slow down...
  9. M

    Reflections on 1MHz serial bus

    Hi. I am having a problem with a 1MHz bus running over a 1.5m line connected to an AVR. As you can see in the image below there is some nasty bounce at the edges of my signals: That is with a terminating the line with a 36 ohm resistor. I picked 36 ohms because I have a device that connects...
  10. M

    Looking for Apollo sensor/device network for fire alarms info

    The card we have is H8/325 based. I will post a picture later for you. Might not be manufactured by Apollo, unfortunately it is installed in a panel and I can't see a model number on the top.
  11. M

    Looking for Apollo sensor/device network for fire alarms info

    My goal is to be able to replace the fire alarm panel with an embedded system running Linux. The current panel we have uses RS485 to communicate with an Apollo interface card. I can't find any documentation for the card though so basically I need a way to talk to devices on the Apollo bus...
  12. M

    Looking for Apollo sensor/device network for fire alarms info

    I keep looking for Apollo network interface cards. I think the confusion arose because they use RS485 to communicate with the microcontroller or PC.
  13. M

    Looking for Apollo sensor/device network for fire alarms info

    Yeah, unfortunately they are not actually that open...
  14. M

    Looking for Apollo sensor/device network for fire alarms info

    Hi. I am looking for documentation on the supposedly "open" Apollo network protocol. It uses RS485 to read various sensors and operate devices in buildings, usually controlled by a fire control system panel. Several companies produce Apollo compatible hardware. I can't find any info on it at...

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