{"id":6,"date":"2014-04-25T10:13:00","date_gmt":"2014-04-25T09:13:00","guid":{"rendered":""},"modified":"2021-05-23T17:35:52","modified_gmt":"2021-05-23T16:35:52","slug":"v911-and-devo-8-upgrades","status":"publish","type":"post","link":"https:\/\/blog.hslracing.com\/rcmodels\/2014\/04\/v911-and-devo-8-upgrades.html","title":{"rendered":"V911 and Devo 8 Upgrades"},"content":{"rendered":"

I bought a V911 Helicopter<\/a> second hand from ebay<\/a>, (\u00a38.87 + \u00a35.00 P&P) that according to the seller only flies around in circles, so may need a new board. I can buy a new board for about \u00a36.00, so this is still a bargain – the remote alone sells for \u00a310.00 and the V911<\/a>, bind and fly, for around \u00a313.00.<\/p>\n

<\/a><\/div>\n

I mainly wanted the remote so that I could remove the A7105 module to add to the CC2500 module I won on ebay<\/a> (\u00a32.37 + \u00a32.38 P&P) to upgrade my Devo 8 Transmitter that I previously<\/a> re-flashed with the deviationtx<\/a> firmware.<\/p>\n

The addition of the A7105  module allows me to use the Devo 8 to control Turnigy\/Flysky, WLToys, Xieda and Hubsan4 protocols.<\/p>\n

The addition of the CC2500 module allows me to control Skyartec, Frsky1 and Frsky2 protocols (although the firnware update for the Frsky ones is still being developed at the moment).<\/p>\n

The steps required are all covered in the Module Installation<\/a> document from deviationtx<\/a>, I did have to make a few small changes as my CC2500 module is not the same as the one shown in the document, it has a built-in aerial and a different pinout. The datasheet<\/a> however explains the pinouts and the adjustments were simple enough to make.<\/p>\n

I thought I would just check the V911<\/a> and transmitter and receiver to ensure they could actually communicate before I ‘butchered’ the transmitter.<\/p>\n

First issue was that the transmitter would not even power on, with brand new batteries installed! I checked the battery compartment with a volt meter and discovered that at least 2 or 3 of the AA cells were not actually making contact at the positive end.<\/p>\n

I resolved this with a few pieces of folded up tinfoil, after which the transmitter powered up without issue, bound with the V911<\/a> and all controls seemed to be working as expected.<\/p>\n

Removal of the A7105 module was a pretty straightforward desoldering job, first I removed the module from the main circuit board, then I removed the individual pins from the module.<\/p>\n

In order to make soldering the wires to the module easier, I drilled out the solder covering the holes where the pins had been with a 0.7mm drill, from my set of carburetor jet drills.<\/p>\n

<\/a><\/div>\n

Here are the two modules ready for installation.<\/p>\n

<\/a><\/div>\n

And from the rear.<\/p>\n

<\/a><\/div>\n

The modules are connected to a combination for the debug port and also the existing CYRF6936 module.<\/p>\n

<\/a><\/div>\n

For the wiring I used 30 AWG Kynar 30awg wrapping wire<\/a>.<\/p>\n

I had a few issues persuading the solder to adhere to the CC2500 module pads, along with the fact that the pins were on a 1.27mm (0.05″) spacing rather than the 0.1″ (2.54mm) spacing on the other two modules.<\/p>\n

Eventually I decided to pre-tin the pads using a smaller tip on the iron at a slightly higher temperature and then drill them out with a 0.60mm drill. After this, the soldering went smoothly.<\/p>\n

All wired up and ready for testing.<\/p>\n

<\/a><\/div>\n

Initially I left out the ground wire between the CYRF6936 module and the CC2500 module, but thought it best to supply all the wiring mentioned in the Module Installation<\/a> document.<\/p>\n

I then made the relevant changes to the tx.ini file on the Devo 8, as mentioned at the end of the Module Installation<\/a> document, whilst connected via a USB cable and uploaded the model information for a V911<\/a> which I found on the deviationtx forum<\/a>.<\/p>\n

I am happy to report that it bound successfully with the V911<\/a> and all the controls are working as expected.<\/p>\n","protected":false},"excerpt":{"rendered":"

I bought a V911 Helicopter second hand from ebay, (\u00a38.87 + \u00a35.00 P&P) that according to the seller only flies around in circles, so may need a new board. I can buy a new board for about \u00a36.00, so this is still a bargain – the remote alone sells for \u00a310.00 and the V911, bind and fly, for around \u00a313.00.…<\/p>\n","protected":false},"author":1,"featured_media":14,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-6","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorised"],"_links":{"self":[{"href":"https:\/\/blog.hslracing.com\/rcmodels\/wp-json\/wp\/v2\/posts\/6","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.hslracing.com\/rcmodels\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.hslracing.com\/rcmodels\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.hslracing.com\/rcmodels\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.hslracing.com\/rcmodels\/wp-json\/wp\/v2\/comments?post=6"}],"version-history":[{"count":1,"href":"https:\/\/blog.hslracing.com\/rcmodels\/wp-json\/wp\/v2\/posts\/6\/revisions"}],"predecessor-version":[{"id":20,"href":"https:\/\/blog.hslracing.com\/rcmodels\/wp-json\/wp\/v2\/posts\/6\/revisions\/20"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.hslracing.com\/rcmodels\/wp-json\/wp\/v2\/media\/14"}],"wp:attachment":[{"href":"https:\/\/blog.hslracing.com\/rcmodels\/wp-json\/wp\/v2\/media?parent=6"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.hslracing.com\/rcmodels\/wp-json\/wp\/v2\/categories?post=6"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.hslracing.com\/rcmodels\/wp-json\/wp\/v2\/tags?post=6"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}