EV Weblog Comments - LED Bargraph battery monitor - part 1 http://www.evconvert.com/ Helping people get rid of Gas since 1995 by: michael brooks (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c003188 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>Hi, Great Idea. I made a pcb layout and used cheap glossy paper and a laser printer to transfer. My first one worked. 12 more to go. Email me if you want the layout.</p> by: uucontghax (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c003164 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>HAM4kf <a href=“http://vskgenmpxxnh.com/”>vskgenmpxxnh</a>, [url=http://znwpxadxsyik.com/]znwpxadxsyik[/url], [link=http://uavnxxzcxmew.com/]uavnxxzcxmew[/link], http://dowadlknwheo.com/</p> by: Tom R Simenstad (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c003048 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>Impatient me started, using strip board. It’s OK for a cirquit with so few components. Just cut out the individual boards. My cutting didn’t come out as nice as yours, James. I used my Dremel with a circle saw blade which flexed a bit so I didn’t get a perfectly straight edge. The Dremel works very well on flesh, too.</p> by: Tom R Simenstad (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c003042 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>James, did you get any <span class="caps">PCB</span>s made? I could take 10.</p> by: Tom R Simenstad (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c003041 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>For those of us who use different <span class="caps">LED</span>s than James, note that R3+R4+R5 sets the <span class="caps">LED</span> current.</p> by: Alec B (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002976 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>I just noticed this link, so I’m still checking it out, but if enough people are interested, I will design and make available (via eBay perhaps) a microcontroller-based battery monitor, with a small color or B/W graphics <span class="caps">LCD</span> display, which will have some intelligence (Battery #5 undervoltage!). Let me know your thoughts, and any inputs for what to add.</p> <p>- Alec</p> by: James May (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002961 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>Hi</p> <p>Part 2 is available on the <a href="http://www.evconvert.com">www.evconvert.com</a> home page at the moment.</p> by: IBDilbert (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002960 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>Can’t wait to see part 2! Great work! This monitor is exactly what I’m looking for and not to complicated for a <span class="caps">DIY</span> project!!!</p> by: James May (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002885 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>The article is written. I have a couple of photos to add to it. It just isn’t live yet.</p> by: Mike M (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002884 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>part 2?</p> by: James May (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002862 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>Hi. I have completed all my diagrams now, that’s the hard part. I think part 2 of the article will be up in 2 or 3 days.</p> by: James May (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002850 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>Hi Malcolm and everyone. I am in the process of writing part 2 to this article. Some of the diagrams have been completed already. It’s quite slow going because presentation is not my string point! Most of the parts came from <span class="caps">CPC</span> which is a UK subsidiary of Farnell. I went to Farnell for the bits I could not get from <span class="caps">CPC</span>. The 200 Ohm trimmer was one of these.</p> by: Malcolm (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002849 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>Hi James! Excellent idea and a fun project! I guess I’ll add my name to your list as I’m very interested in making one of these myself for my car. Even a picture of the board layout would be helpful. I’m of course interested in etched boards if you do make them. Anyone have part numbers from mouser or digikey for the parts? -Malcolm</p> by: Jim B (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002848 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>Hi Guys, Just to let you know, On Ebay, theres a Chinese Co.(Asia Eng) that sells <span class="caps">LCD</span> voltmeters that dosen’t require Pwr. Just run your 2 leads from your Batt to the Meter. There small, 1.5“x3”, comes in Red, Grn, or Blue,& cost 14.95 which includes shippment. You can tell what your Batt. is at a glance. It seems like it would be a lot less work than the Bargraph monitor</p> by: Mike M (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002838 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>http://www.electronics-lab.com/projects/automotive/009/index.html</p> by: EVdude (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002836 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>that will be fine. i won’t start until at least next month with the conversion. just let me know when you can because there is no rush on them.<br /> Thanks!</p> by: James May (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002835 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>Hi, you guys have caught me napping again!<br /> OK, I’ll write some sort of part 2 this week. There’s actually no <span class="caps">PCB</span> to etch right now as I used stripboard to make the existing meters. I’ll design a <span class="caps">PCB</span> for you to etch but it probably will not look too different from standard stripboard.<br /> EVdude – Can you let me think about the pricing for a few days?</p> by: EVdude (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002834 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>James,<br /> Can you tell me how much you would charge me to make thirteen of the 12 volt versions of the bargraph monitors. I will not need them immediately and may not be able to pay for them for several weeks but i will buy them and pay to have them shipped to my address if they don’t cost too much.</p> by: Cyrus (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002832 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>Can you provide a pcb that we can get etched? That would be great. I’m converting a fiat 124 with my engineering class and I want to use this<br /> Thanks</p> by: Mike M (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002676 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>Thank You…</p> by: James May (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002674 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>I know, I know! I’ll get on it!</p> by: Dave Garfield (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002661 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>James!<br /> When might we expect the second part of this fascinating article? I’m sure that the step-by-step instructions will be valuable to those less electronically adept.<br /> Thank you for this article! The information is quite valuable to we EV owners and aspirants!<br /> Dave</p> by: James May (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002659 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>Hello Matt</p> <p>It’s a good idea to use the <span class="caps">DIL</span> bar graph type <span class="caps">LEDS</span> in either red or green. The current going through the <span class="caps">LED</span>s is set by the resistor valued used in the circuit so you don’t have to worry about slightly different <span class="caps">LED</span> voltages for different colours. From memory the current is around 10 milliamps.</p> <p>The mode pin can be either left unconnected which will mean that only on or possibly 2 <span class="caps">LED</span>s will light at once or ic can be connected to positive after the diode which will light up all the <span class="caps">LED</span>s beneath the one which shows the value (i.e. dot or bar mode) My advice is use dot mode. Lighting up all the other <span class="caps">LED</span>s uses extra current and might cause a slight change in the readings due to increased voltage drop in the wires the the batteries.</p> by: Matt (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002658 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>Hi James! <br /> Thanks for sharing this useful device.. I just want to ask you a couple of things.. since I’ll be making the bar display myself and I’m somewhat green at electronics – what sort of <span class="caps">LED</span>s should I use? <br /> What do I do with the ‘mode’ pin?</p> by: James May (LED Bargraph battery monitor - part 1) http://www.evconvert.com/article/led-bargraph-battery-monitor#c002643 <p><strong>LED Bargraph battery monitor - part 1</strong></p> <p>Hi Glen</p> <p>Thanks for that advice.<br /> I had better get making that artwork.<br /> I had a look at your link. That van take you all weekend to fix up! Guess It’ll keep you out of trouble for a while! I am currently working on my own rust-ridden basket-case <a href="http://www.evalbum.com/1640">Nightfire Special</a>. Mine has no bulletholes though. Good luck!</p>