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It is also a good idea to implement checking the Busy Flag when writing to the LCD-display.
This way you are always ready for the next command, and it is not necessary to add delays.
Some of the commands take longer time to execute for the LCD, and reading the BF will automatically adjust...
If you are multiplexing the 6 digits, you only need a power supply big enough to drive one digit at the time, in this case 450mA depending on the segment current.
This is the whole idea with multiplexing, spreading the energy between each device in time.
For driving the displays and segments I...
0 - 10V and 0(4)-20mA is normal industrial interfaces.
One thing about 4 - 20mA is that many sensors transmit error levels in the 0-4mA range and some also above the 20mA level (22-23mA).
To make a proper interface you should take this into account, and check out the sensors you want to use...
Are the two chips connected to the same power? Did you measure Vdd on both chips when doing the measurement on Fig2?
From your curve in Fig2 it looks like the RAM has a low Vdd voltage or a too high load on the signal.
If the signal measured is two ends of the 'same' line, you could have...
Are you sure that the connection between the two MAX chips are correct. RX1 <- TX2 and TX1 -> RX2.
If you are connecting the two TX's together the one with the lower voltage will dominate, due to output protection.
I suppose you are using the RS232 sides on both drivers, not mixing logic and...
The reason to use an optocoupler with a low CTR is the transfer speed of the signal.
The higher the CTR, the slower the signal you can get through it.
TOK ;)
I think I would have had the control in the wand, maybe a small omnidirectional camera of the same type used in optical mice.
Make the optics so you look at the size of the ball and that indicates the distance.
If you add a accelerometer so you know the direction of the wand, you can direct...
The 7812 regulator has a max Vin of 35V.
If you get spikes just below this voltage you could drive it into malfunction, especially without any kind of capacitors to stabilize it.
Description in quote above.
The saved graphic character will be displayed if you write a character code =00.
The first 8 character codes are mapped to the CGRAM, so you may use up to 8 such graphics. They will normally also repeat for the next 8 chr codes. before the characters in the charactr...
I2C is a lokal communication bus, and used inside a few meters. If the distance is greater you need a more robust bus, or more hardware to split the bus into sections.
RS485 is defined as a 2-wire half duplex multidrop bus, normally master/slave, and you will meet som problems regarding...
You could make a table from your tests, and interpolate for the values beween the table values. Depending on how many testpoints you have in the table, this should give you as good a value you may get from a LDR.
How long is the distance between each PIC?
If you have 3 or more PICs one idea could be a looped bus. each PIC has one receiver and one transmitter. PIC1 TX to PIC2 RX, PIC2 TX to PIC3 RX, and PIC3 TX to PIC1 RX. If the normal condition is that all (RX) are connected to (TX) inside the...
In addition to the things said above, many microprocessors has an inbuilt priority system for the different interrupts. This priority may also be programable to a certain degree.
Many of the smaller microprocessors have high priority nonmaskable interupts, normally one. This will always...
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