{"id":1394,"date":"2015-08-26T21:15:10","date_gmt":"2015-08-27T07:15:10","guid":{"rendered":"http:\/\/blog.familjenjonsson.org\/blog\/?p=1394"},"modified":"2017-02-25T18:34:42","modified_gmt":"2017-02-26T04:34:42","slug":"microsquirting-the-nc30-part-6-its-alive","status":"publish","type":"post","link":"https:\/\/blog.familjenjonsson.org\/blog\/2015\/08\/26\/microsquirting-the-nc30-part-6-its-alive\/","title":{"rendered":"Microsquirting the NC30, part #6: It’s alive!"},"content":{"rendered":"

All that remained before we’d have the Microsquirt alive when the last post<\/a> ended was to plug everything into the connector… only there was a small setback.<\/p>\n

The minimal test was to only wire up the power and the serial lines and make sure that we could talk to it over the Bluetooth modem. Except when I did, I got nothing.<\/p>\n

After some troubleshooting with the scope, I concluded that transmission from the laptop to the Microsquirt made it fine through the bluetooth modem and the RS-232 transceiver. Nothing came back, however. And looking at the circuit board, I suddenly noticed…<\/p>\n

\"This<\/a>

This is where the RS-232 tranceiver breakout board is plugged in. Notice something funny with the traces?<\/p><\/div>\n

In the picture, note how there are traces going to “T1IN” and “T1OUT” (that’s the transmitter 1 input and output) and “R2IN” and “R1OUT”… Whoops. The board has 2 transmitters and 2 receivers, and apparently I had wired up the inputs and outputs to different recievers. That certainly explains why nothing was coming back.<\/p>\n

I think I know what happened here. My custom-made EAGLE symbol for the breakout board had the inputs on one side and the outputs on the other, but I never bothered to line up the two inputs with the corresponding outputs. So when I made the connections, I must have just connected the pins that lined up, without verifying the labels.<\/p>\n

Oh well. While annoying, it’s easy to fix.<\/p>\n

\"Problem<\/a>

Problem solved. After this change, the communication worked perfectly.<\/p><\/div>\n

With that, the Microsquirt connected up to the tuner software on the laptop fine, so I proceeded to wire up the remaining connections.<\/p>\n

\"After<\/a>

After connecting all remaining wires to the appropriate pins on the 35-pin connector, it’s getting quite crowded in that little space.<\/p><\/div>\n

After entering the correct calibration constants for the pressure and temperature sensors, I now have sane-looking sensor readouts.<\/p>\n

\"Both<\/a>

Both pressures and temperatures look reasonable.<\/p><\/div>\n

The manifold and ambient pressure reads 99kPa (the weather station says the current pressure is 99.8kPa) and the coolant and intake (not shown) temperatures were 29C. Seems satisfactory.<\/p>\n

I also verified that the control of the radiator fan works by telling it to turn on at 25C. This did indeed turn the fan on.<\/p>\n

The only remaining thing to wire up is to connect the oxygen sensor wires to the wideband controllers. I didn’t want to cut those wires until I knew what things were going to look like, but now the time for that has come too.<\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

All that remained before we’d have the Microsquirt alive when the last post ended was to plug everything into the connector… only there was a small setback. The minimal test was to only wire up the power and the serial lines and make sure that we could talk to it over the Bluetooth modem. Except …<\/p>\n

Continue reading ‘Microsquirting the NC30, part #6: It’s alive!’ »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[4,29],"tags":[11,13,15],"class_list":["post-1394","post","type-post","status-publish","format-standard","hentry","category-motorcycle","category-nc30","tag-electronics","tag-motorcycles","tag-nc30"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/posts\/1394","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/comments?post=1394"}],"version-history":[{"count":1,"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/posts\/1394\/revisions"}],"predecessor-version":[{"id":1400,"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/posts\/1394\/revisions\/1400"}],"wp:attachment":[{"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/media?parent=1394"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/categories?post=1394"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/tags?post=1394"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}