Meanwell LDD driver: for those who want to dim to 0 using Arduino

Hey O2,...morning! I have a question. I'm trying to get my fan to come on through my Jarduino. The controller will control fan speed per the reading it gets from the DS18B20.
My problem,...the an won't turn on. I've check and rechecked the hook up a bunch of times and am 99% sure its correct. I apply some heat to the 18b20, and nothing.

Is there a way to check the 18b20 to see if its good, or can you jump it or jump around it through its 1 2 3 pins to find out how its working? Thanks,---Rick
 
007Bond said:
Hey O2,...morning! I have a question. I'm trying to get my fan to come on through my Jarduino. The controller will control fan speed per the reading it gets from the DS18B20.
My problem,...the an won't turn on. I've check and rechecked the hook up a bunch of times and am 99% sure its correct. I apply some heat to the 18b20, and nothing.

Is there a way to check the 18b20 to see if its good, or can you jump it or jump around it through its 1 2 3 pins to find out how its working? Thanks,---Rick
Click to expand...

Hey Rick!

Wow- That's a trouble shooting "pickle" for sure, but I'll do what I can to help. First off- the DS18b20 isn't like a NTC thermistor with an internal switch that can be bypassed or jumped for testing purposes. It's a temperature sensitive logic device that transmits data only. The micro-controller chip on your Mega receives the data form the temp sensor and then makes a decision( based on it's programming ) whether to turn "on" the cooling fan or not. I haven't built a Jarduino, so I'm not exactly familiar with it's software, but I think that if you can "Divide & Conquer", you'll be able to find the problem. Can you access all your temp sensors or manually activate the fan from the Jarduino controllers touch screen? If you can, then take a look at the data coming from the temp sensor in question. Does the temp shown look plausible? If not, Go look at the sensor circuit. If the temp data looks correct- Is the temp high enough to have triggered the fan? Did you turn on the fan manually and it didn't respond? If so, The problem lies between the Mega & the fan. Start by checking your hardware for proper voltages/ grounds ect.. Start at the Mega and work your way toward the fan.

I wish that I could do more to help...but I'm too far away to lend a hand. LOL
 
Thanks O2,...you answered my question on jumpering the think. Do they have a history of failure, or are they to simple. The one thing that is popping up in my mind, is when I first set up the Jarduino a year ago to test things and just see it work, I had to assign addresses to the 18B20's so I could get the Jarduino to show which piece of equipment I was reading. I ended up blowing the mega :headwally: with a bonehead move, so I bought another.
I had to upload my Jarduino program to the new mega. Do you think I need to retrieve the b20's addresses again for the new board, or would the addresses still be in the program when I uploaded it again :confused: Appreciate your input O2, Thanks,---Rick
 
007Bond said:
Thanks O2,...you answered my question on jumpering the think. Do they have a history of failure, or are they to simple. The one thing that is popping up in my mind, is when I first set up the Jarduino a year ago to test things and just see it work, I had to assign addresses to the 18B20's so I could get the Jarduino to show which piece of equipment I was reading. I ended up blowing the mega :headwally: with a bonehead move, so I bought another.
I had to upload my Jarduino program to the new mega. Do you think I need to retrieve the b20's addresses again for the new board, or would the addresses still be in the program when I uploaded it again :confused: Appreciate your input O2, Thanks,---Rick
Click to expand...

My guess is- if it doesn't show up on the display, you'll need to input its address again.
 
marspeed said:
some pwm fans won't start at less than 25 - 40% of power
Click to expand...

I have 12v going to them. If I jump around the circuitry it starts.

O2,...I guess I'm going to reinput the addresses again,...but its been so long since I did it the first time, going to be a pain in the ###.(1/2 dozen program steps)
:mad:---Rick
 
Hi reefer, I had the addresses loaded on my first mega before I bricked the darn thing. Now on my 2nd mega. When I loaded my Jarduino program,...are you saying that the addresses were not still in my Jarduino files? It makes the most sense being the fan and 18b20 circuits on the Jarduino tutorial are real simple. Thanks,---Rick
 
If you saved a copy of the sketch with your addresses plugged into it then yes they are still there, otherwise no.

Somebody much smarter than me should really write some auto addressing code for multiple temp sensors like was done on the storm Controller. (I have no idea how that works, it only uses one though, it's way beyond my skill level but it does)

It would be a huge help to all the DIY arduino projects around........
 
007 I would re do the codes for each one just to rule that out as a problem also like marspeed was saying I remember some thing about some people who had problems with there fans not working and the need to adjust the on temps of the fans in the code
 
Well that my underlining thought that the addresses were in my sketch, at least they were prior to me bricking the board. So I thought I just needed to uploaded the same sketch to the new board. :( I think my next move is to recheck the addresses.---Rick
 
I had the addresses loaded on my first mega before I bricked the darn thing. Now on my 2nd mega. When I loaded my Jarduino program,...are you saying that the addresses were not still in my Jarduino files? It makes the most sense being the fan and 18b20 circuits on the Jarduino tutorial are real simple
Click to expand...

If the 18b20 sensors are the same as before the you don't need to re-do the addresses as they ought to have been written into your specific Jarduino sketch. I had a similar issue when I blew a Mega and I discovered that in blowing the Mega I actually blew the 18b20 sensors as well. I swapped them out and set up the new addresses and worked perfectly. Another thing I did was I took out the 4.7k resistor and installed a variable pot resistor and found that due to the distance of the sensors from my Mega the optimum resistance was 3.9k and lastly I gave the sensors its own 5v supply.
 
proietti said:
If the 18b20 sensors are the same as before the you don't need to re-do the addresses as they ought to have been written into your specific Jarduino sketch. I had a similar issue when I blew a Mega and I discovered that in blowing the Mega I actually blew the 18b20 sensors as well. I swapped them out and set up the new addresses and worked perfectly. Another thing I did was I took out the 4.7k resistor and installed a variable pot resistor and found that due to the distance of the sensors from my Mega the optimum resistance was 3.9k and lastly I gave the sensors its own 5v supply.
Click to expand...

Thanks proietti!!!...that sounds exactly like where I'm at with this. I'm going to redo per your directions, and I bet problem solved. As I said the 18b20 and the fan circuits are pretty simple, so readdressing the b20's is next.

Hey guys,...another question please on molex pin installs.
I have never done pin to wire bonding, and have watched some turtorials, but these pins are real small and I'm having a bit of trouble seeing the correct way to attach the wire to the pin,....anyhow do you have any links you can post on how to?
this is the pin I'm using.(have 100+ to do) http://www.digikey.com/product-detail/en/0008500135/WM9727CT-ND/4037903

Then I also am looking for the correct crimp tool for this particular pin.
I have checked ebay and the cost are all over the place. I don't want to spend 50 to 75 bucks to do my 100 pins. Any input on which crimp tool and where to buy would be appreciated. Thanks fellows :thumbsup: ,---Rick
 
Hi folks,

Just wanted to say thanks to the people who have contributed to this thread and especially to those who've put gerber files up. Very kind of you to share your efforts :)

I've read most of the last 30 pages, but couldn't bring myself to start from the beginning :o

Tim
 
007Bond said:
Thanks proietti!!!...that sounds exactly like where I'm at with this. I'm going to redo per your directions, and I bet problem solved. As I said the 18b20 and the fan circuits are pretty simple, so readdressing the b20's is next.

Hey guys,...another question please on molex pin installs.
I have never done pin to wire bonding, and have watched some turtorials, but these pins are real small and I'm having a bit of trouble seeing the correct way to attach the wire to the pin,....anyhow do you have any links you can post on how to?
this is the pin I'm using.(have 100+ to do) http://www.digikey.com/product-detail/en/0008500135/WM9727CT-ND/4037903

Then I also am looking for the correct crimp tool for this particular pin.
I have checked ebay and the cost are all over the place. I don't want to spend 50 to 75 bucks to do my 100 pins. Any input on which crimp tool and where to buy would be appreciated. Thanks fellows :thumbsup: ,---Rick
Click to expand...

After crimping a bunch of those little 0.1" pins with needle-nose pliers and the tips from my wire strippers, I really wish I would have bought the crimping tool... I almost bought this one when I bought all my pins and housings:
http://www.pololu.com/product/1929
 
Hey Thanks! fellows for the links/info. The link that kaskiles linked has a very good "how to" with the tool that is very clear and easy to understand having not done these before. Thanks again :thumbsup:---Rick
 
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