tag:blogger.com,1999:blog-4350777349185682004.post-20346719145334169982008-05-08T22:42:00.000-07:002008-05-08T22:57:03.212-07:00The OBI-02-5 is a 6V battery level indicator made up of 10 SMD LEDs driven by a LN3914N indicator driver. I wanted to use one of these on my RN-1 robot, not necessarily for the indicator but because all humanoid robots need cool looking LEDs :-).<br /><br />GWS make various versions for 4, 5 and 6 cell NiMH/Nicad cells(4.8V, 6V and 7.2V) specifically for RC applications. GWS ships the indicators configured to only light up one LED at a time. I wanted all indicator to light up like a BAR indicator rather than a dot/point indicator.<br /><br />The datasheet for the LM3914N shows that it is capable of displaying in bar mode. The mode selection pin (pin 9) needs to be hooked up to the V+ pin (pin 3).<br /><br />Pictures:<br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://www.abstractpath.com/weblog/uploaded_images/SPM_A0203-735808.jpg"><img style="margin: 0pt 10px 10px 0pt; float: left; cursor: pointer;" src="http://www.abstractpath.com/weblog/uploaded_images/SPM_A0203-735797.jpg" alt="" border="0" /></a><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />The indicator board from the front<br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://www.abstractpath.com/weblog/uploaded_images/SPM_A0202-735770.jpg"><img style="margin: 0pt 10px 10px 0pt; float: left; cursor: pointer;" src="http://www.abstractpath.com/weblog/uploaded_images/SPM_A0202-735760.jpg" alt="" border="0" /></a><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />The indicator board from the back<br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://www.abstractpath.com/weblog/uploaded_images/SPM_A0205-705758.jpg"><img style="margin: 0pt 10px 10px 0pt; float: left; cursor: pointer;" src="http://www.abstractpath.com/weblog/uploaded_images/SPM_A0205-705745.jpg" alt="" border="0" /></a><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />The back of the board after modification<br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://www.abstractpath.com/weblog/uploaded_images/SPM_A0208-712449.jpg"><img style="margin: 0pt 10px 10px 0pt; float: left; cursor: pointer;" src="http://www.abstractpath.com/weblog/uploaded_images/SPM_A0208-712361.jpg" alt="" border="0" /></a><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />RN-1 proudly displaying his lightstumtumtumhttp://www.blogger.com/profile/08707154189579608918noreply@blogger.com