 | | (no subject)
|
|
(...) all sensor inputs have a 47K pull-up resistor. If you remove this (by cutting the trace between the sensor input pin and the 47K resistor pack), then the analog inputs are pretty high impedence, like a meg or so. You should get the "M68HC11 (...) (28 years ago, 7-Jun-96, to lugnet.robotics.handyboard)
|
| |
| | (no subject)
|
|
Hi! Would you please let me know the input impedance of the AD circuit ? Thanks in advance. hajime (28 years ago, 7-Jun-96, to lugnet.robotics.handyboard)
|
| |
| | Re: your mail
|
|
Yes, the h-bridge circuit is very, very, very confusing. Hmm. Well it's in my robot right now, so lemme see if I can remember how it works. Ok, let's see. First, you connect both of the emitters of the PNP power transistors to +6V or whatever. (...) (28 years ago, 6-Jun-96, to lugnet.robotics.handyboard)
|
| |
| | (no subject)
|
|
I'm having a little truoble with the H-Bridge described in this mailgroup. I have MOST of the circuit OK.. The power bridge itself, Diodes, etc.. I am also OK with the optocouplers to 2n2907s.. I am just a bit confused with the description if the (...) (28 years ago, 6-Jun-96, to lugnet.robotics.handyboard)
|
| |
| | Serial IO
|
|
Yesterday I experimented with the Serial IO code in the FAQ. I have a couple of questions though. Here is the basic program that I wrote to try to understand this stuff: I wrote this into hb_lib.c: void disable_pcode_serial() /* necessary to receive (...) (28 years ago, 5-Jun-96, to lugnet.robotics.handyboard)
|
| |
| | Re: Question on analog()....
|
|
(...) Right; a voltage divider probably biases the microphone amp ckt at 2.5v. schematics are provided, no? -F (28 years ago, 5-Jun-96, to lugnet.robotics.handyboard)
|
| |
| | Re:Re: Question on analog()....
|
|
(...) Are you sure about this? On page 49 of my copy, it states pretty clearly that the input range is 0 to 5 v. ---...--- Just returned home. I checked the IC Manual of "The Mobile robot Assembly Guide" for the Rug Warrior. On p.66, it reads "When (...) (28 years ago, 5-Jun-96, to lugnet.robotics.handyboard)
|
| |
| | Re: Question on analog(). Negative voltage
|
|
(...) DO NOT SEND NEGATIVE VOLTAGES INTO THE 6811, you will destroy the analog input circuit. Any voltage outside of the 0 to 5 v range is hazardous, unless it is current-limited to a few milliamps. (...) Are you sure about this? On page 49 of my (...) (28 years ago, 5-Jun-96, to lugnet.robotics.handyboard)
|
| |
| | Question on analog(). Negative voltage
|
|
Last time, I learned that the values of analog() corresponds to the voltage between 0 and 5. What if the signal to the analog port is a negative voltage. For example, -2 volt ? In that case, does that mean I have to use another formula or make some (...) (28 years ago, 5-Jun-96, to lugnet.robotics.handyboard)
|
| |
| | encoders??
|
|
Let's see. First, I'd like to put a pair, if possible, of shaft encoders on my robot. (It's annoying not being able to tell how far I've gone!) Anyways, digital inputs 7 and 9 are being used by a 6500 Polaroid sensor and an RC servo. Is it still (...) (28 years ago, 5-Jun-96, to lugnet.robotics.handyboard)
|
