Matrix user forums

Yes it is consistent.
With 0V the raw value is 6. With exactly 2.5V is it 519 / 520.
It never goes over 1023

Henk

For years I have been using the PIC 18F4685 for our equipment. Never had any issues however recently I had to use a PIC 18F4682 as the 5 was not available. Everything seemed to be working normal until I realized that all the Analog values are a bit too high. When applying a clean 2.5V on the an anal...

Thanks CF
Weird enough, in simulation mode you can use the local and it actually works. Tonight I will change the local to a global and see if that makes the difference

Henk

Hello Trying to figure out why the "string Compare" function doesn't work for me. I have to strings that are identical however, the return value of the compare function still returns 255. Same applies if the 2 strings are not the same... still 255 Flag_identifier = Compare$ (.Identifier,Wo...

Thanks for the information. Not sure which setting did the trick but it seems to be working!

I'd like to get some help with the decoding of an I2C sensor. The MPRLS sensor is connected to an 18F4685 and with my (rigol) scope I can see the signals just fine and the scope is decoding the correct values. Attached is the code which used to work, however for some reason after a compile, the &quo...

Thanks for your quick reply Ben,

The signal is a square wave, not a SIN.
Let me play around with some resistors. Both PIC and incoming 40Khz signal are 5V.!

Henk

Hi Ben, Thanks for your reply. In the meantime have changed the code in order to make it work. Let me try to describe the problem. (I'm using the 18F4685) On the B0 channel I'm receiving a 40Khz signal (pulse train) (Signal is 0-5V pk-pk). The hardware interrupt should be reacting on the first falli...

Hello All,
I'm trying to enable an interrupt on the falling edge of B0.
The signal is a 40khz pulse. As soon as this signal is present, the interrupt routine should be enabled. Unfortunately it doesn't.
Could this because the Interrupt frequency on B0 / INT0 is only 15Hz?

Thanks
Henk

All, The MCP3008 - PIC interfacing is solved. Attached is the code. All straight forward. The actual problem why I had inconstant readings was caused by the grounding of my breadboard. In the passed I had experienced this before and again I had this issue. Because the backplate of the breadboard is ...

Ben, Attached is the FC5 code. When connecting the Analog 0 pin to Ground the SPI gives 0, with that pin to +5V, the SPI provides 1023. So far so good. When giving 1V, the SPI should give about 200, however this is not the case; The value is all over the place... I'm afraid it has something to do wi...

Hello, Has anyone used the analog to SPI converter MCP3008. I'm trying to make this work with an 18F4685 but no luck. I'm using the SPI component sending byte 0x01 and then a byte containing 0x08. This is the start byte and the byte requesting data from channel 0 The problem is that the data I'm get...

Thanks for the quick reply Ben,

I'll give this a try
Henk

Hello, I have a project where I'm using different components (real time clock, light sensor and temperature sensor) that are using the SPI protocol. From my PIC I have made a SPI bus connecting these sensors to collect their data. The problem I have now is that of the three components, one requires ...

Do you guys have this example in FC5???

Personally I don't think that this is a flowcode issue. I think it is a hardware related problem.
I think I should put a scope on the signal and see how clean the pulse is.
After I checked this, I'll let you know.

Martin,

Both interrupts are on the falling edge..
Attached are two snap shots.

Could it be a problem that I only enable the interrupt and leave it enabled?

Thanks
Henk

Good day, on a project I'm working on, I'm using two interrupts. One receives a pulse at a frequency between 1 and 30Hz (an RPM Hall sensor), the other one only once every 10 to 15 minutes (output from another micro processor) I have noticed in the data that I'm collecting that sometime the data of ...

When googeling, found this....
http://www.matrixmultimedia.com/mmforum ... =26&t=7375

kind of answer my question so I should be able to get started with this.

Hello All, I have a sensor that provide datas through CAN-BUS (NMEA 2000 to be precise). I'd like to start reading the data on the bus but as I have never really done anything with CAN BUS is new to me. I understand the CAN-bus principle, however, I'd like to get some feedback on how to physically c...

Thanks Grant.
Yes, I issue an "I2C INIT" at the start of my main program.
I will try the 0x46 / 0x47. I didn't realize you have to add that bit to the byte you clock out.

Thanks
henk

Dazz, I have attached the Macro I have created for this. I just noticed that it is not only the stop byte that stops the program. Again, I have very little to no I2C experience... http://www.dfrobot.com/image/data/SEN0097/BH1750FVI.pdf Page 17 on the pdf shows the sequence of the measurement... Than...

I have never used I2C before, but I just purchased a sensor using the I2C protocol. According to the Datasheet I need to send the following I2C data: - Start - 0x23 -> this is the Slave address - 0 - 0x10 -> Slave will start measuring - stop wait 100 msec - Start - 0x23 - 1 +Read High Byte +Read Low...

Johnny,

Thanks for your reply. I will make a new program (small) only doing the section with the compare function.
Having said this, what seems odd that the same code works when compiled with FC3, but not with V5.4.

Henk

Ben,

the FCV file is too large.
Can I send it to an email?