{"id":239,"date":"2014-09-30T18:58:52","date_gmt":"2014-09-30T18:58:52","guid":{"rendered":"http:\/\/blogs.discovery.wisc.edu\/wearable14\/?p=239"},"modified":"2014-09-30T18:58:52","modified_gmt":"2014-09-30T18:58:52","slug":"the-map-function","status":"publish","type":"post","link":"https:\/\/blogs.discovery.wisc.edu\/wearable14\/2014\/09\/30\/the-map-function\/","title":{"rendered":"The Map Function"},"content":{"rendered":"

Here is a function that may be useful for many of the projects.<\/p>\n

map(value, fromLow, fromHigh, toLow, toHigh)
\nhttp:\/\/arduino.cc\/en\/reference\/map<\/a><\/p>\n

Here is a diagram of how this function works<\/p>\n

\"map1\"<\/a><\/p>\n

The function takes a value<\/strong> that is in the range of fromHigh<\/strong> to fromLow<\/strong>.\u00a0 It then remaps the value<\/strong> to toHigh<\/strong> to toLow<\/strong>.<\/p>\n

One very nice applicatin of this technique is for remapping analog input to analog output.<\/p>\n

\n
\nvoid<\/span> loop<\/span>(<\/span>)<\/span>
\n{<\/span>
\nint<\/span> val =<\/span> analogRead<\/span>(<\/span>0<\/span>)<\/span>;<\/span>
\nval =<\/span> map<\/span>(<\/span>val,<\/span> 0<\/span>,<\/span> 1023<\/span>,<\/span> 0<\/span>,<\/span> 255<\/span>)<\/span>;<\/span>
\nanalogWrite<\/span>(<\/span>9<\/span>,<\/span> val)<\/span>;<\/span>
\n}<\/span><\/div>\n
<\/div>\n
Another interesting aspect of this function is that it allows us to flip the lows and highs as shown in the diagram below.<\/div>\n<\/div>\n

\"map2\"<\/a>This may be really useful for items such as the RGB LED that work by driving a signal low.<\/p>\n","protected":false},"excerpt":{"rendered":"

Here is a function that may be useful for many of the projects. map(value, fromLow, fromHigh, toLow, toHigh) http:\/\/arduino.cc\/en\/reference\/map Here is a diagram of how this function works The function takes a value that is in the range of fromHigh to fromLow.\u00a0 It then remaps the value to toHigh to toLow. One very nice applicatin … Continue reading The Map Function<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[],"_links":{"self":[{"href":"https:\/\/blogs.discovery.wisc.edu\/wearable14\/wp-json\/wp\/v2\/posts\/239"}],"collection":[{"href":"https:\/\/blogs.discovery.wisc.edu\/wearable14\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.discovery.wisc.edu\/wearable14\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.discovery.wisc.edu\/wearable14\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.discovery.wisc.edu\/wearable14\/wp-json\/wp\/v2\/comments?post=239"}],"version-history":[{"count":1,"href":"https:\/\/blogs.discovery.wisc.edu\/wearable14\/wp-json\/wp\/v2\/posts\/239\/revisions"}],"predecessor-version":[{"id":242,"href":"https:\/\/blogs.discovery.wisc.edu\/wearable14\/wp-json\/wp\/v2\/posts\/239\/revisions\/242"}],"wp:attachment":[{"href":"https:\/\/blogs.discovery.wisc.edu\/wearable14\/wp-json\/wp\/v2\/media?parent=239"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.discovery.wisc.edu\/wearable14\/wp-json\/wp\/v2\/categories?post=239"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.discovery.wisc.edu\/wearable14\/wp-json\/wp\/v2\/tags?post=239"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}