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  1. CDRIVE

    Serial communication problem.

    Are we digging this up again? Look here: https://www.sparkfun.com/tutorials/215 While RS232 "Idle State" may infer logic 0 .... it doesn't. Chris
  2. CDRIVE

    Circuit Element for variable current control

    Not to be "cheeky" but I do believe that the natural order of life on Earth does not include the student dictating the rules to the teacher. Perhaps an illogical relationship like that can be found on Instructables.com. That place is loaded with extraterrestrials and chuck full of "vague", so...
  3. CDRIVE

    PIR operated DC motor project odd behaviour help

    Unfortunately I'm not psychic and I'm running out of ideas. Perhaps it's time or possibly long past due that you post sharp photos of your setup. Maybe we'll see a clue in the pix . Chris
  4. CDRIVE

    PIR operated DC motor project odd behaviour help

    I guess you can try the vibration motor output connected to the Opto. Correct polarity of course.l Just a side note: You do realize that the timer will trip from a very brief signal on the opto input. If the timer times out while the opto is still live it'll probably begin another timing cycle...
  5. CDRIVE

    PIR operated DC motor project odd behaviour help

    What I'm going to ask you to do next is really lame but I'm lost for a logical explanation.... Disconnect the ringer output from the Opto input on the timer board. The connect a 560Ω across the ringer output. Measure the voltage across the resistor with and without the ringer ringing. Chris
  6. CDRIVE

    USB to UART serial converter.

    Uh-Oh.:oops: Post 68!:eek: It would appear that it was non other than me that derailed the train and caused this sloppy mess!:rolleyes: Your Honor, I ask mercy from the court because this thread is not Constantine's first battle with MAX232, 3232 chips. He's been battling with them in other...
  7. CDRIVE

    Serial communication problem.

    Dork, you said it has become a spaghetti bowl. Harald, you said things are getting a bit confused now, it seems. Your both being to kind. I'm going crazy! Anyone wanna come? :p BTW, no arguments with the RS232 details in either of those posts.;) Chris
  8. CDRIVE

    USB to UART serial converter.

    You're talking Apples. I'm talking Pears. What RS232 levels?? There are none in this scenario. That USB/TTL board never sees RS232 (+ -) voltage levels. It's a virtual (USB) serial port with CMOSTTL outputs only... There's no RS232 or TTL Inputs whatsoever. It's a one direction Output device...
  9. CDRIVE

    USB to UART serial converter.

    Somewhere in this exceedingly lengthy thread something was said by Constantine that implied or possibly stated that this is one way communication from a PC to a uC. If so I see no need for RS232 voltage levels. A USB/TTL board (The Link he posted) should fill the bill. Chris
  10. CDRIVE

    PIR operated DC motor project odd behaviour help

    That's not possible.o_O It's a simple circuit hookup but you have something very wrong there! Disconnect everything except power to the timer board. Then measure any voltage present on the Opto input pins. It should be Zero Volts because the Opto input consists of nothing more than a LED and...
  11. CDRIVE

    USB to UART serial converter.

    I don't believe that Ivan has the stand alone chip. I think he said he purchased (Ebay) the complete USB/TTL converter. You'll have to search back through this thread to see where this thread switched tracks. Chris
  12. CDRIVE

    USB to UART serial converter.

    On another note and since this thread focuses on both the RS3232 and the CP2102, here's a level shifter if you need to level shift from 3V to 5V logic level. It's none inverting so a logic1(3V) in = a logic1 (5V) out. I believe your USB/TLL(CP2102) module provides a +5V Vcc output. Chris
  13. CDRIVE

    USB to UART serial converter.

    It makes sense to me but let's let EB take the reins because he's actually implemented it. It's all that crisp clean air in Switzerland. It makes the brain work better! :) Chris
  14. CDRIVE

    USB to UART serial converter.

    Probably because EB is unaware that you've shifted this thread from the MAX232 to a CP2102. Personally I love EB's Resistor fix :cool:for the MAX3232. It makes sense. That said your better off staying with the Direct USB/TTL (CP2102) module because your project doesn't require the bidirectional...
  15. CDRIVE

    PIR operated DC motor project odd behaviour help

    Well, after rereading your post below I think you should measure the ringer output that's connected to your opto input. What you're describing seems to indicate that there's a voltage present even when it's not ringing. Chris
  16. CDRIVE

    DC currents through Rd and Rs in JFET amplifier

    Ditto! Chris
  17. CDRIVE

    PIR operated DC motor project odd behaviour help

    I think we're going to have to backup a bit. I'm an old dog that's still using a flip phone. I had to google GSM and "GSM Ringer". Up until now I've been under the assumption that you've been picking the ringer voltage (hard wired) off of your GSM. From what I read am I to understand that your...
  18. CDRIVE

    DC currents through Rd and Rs in JFET amplifier

    That circuit is typical of an NPN (bipolar) biasing arrangement. Since that's a class A JFET amplifier I'm curious why R1 is in there? It would seem counter productive to the negative (GS) bias voltage, needed for an NCHJFET and produced by Source current flowing through RS. On the other hand...
  19. CDRIVE

    PIR operated DC motor project odd behaviour help

    I forgot to mention the you don't need the motor to test the timer board. Referring to the photos you'll see it incorporates two LEDs. One marked "Power" and the other "Running Indicator". The Running Indicator will light during the timing period after the timer is tripped. Chris
  20. CDRIVE

    PIR operated DC motor project odd behaviour help

    The only way that Diode would have smoked is if you wired the power supply polarity backward. As far as your button is concerned.... What button? :confused: Chris
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