{"id":5929,"date":"2011-04-20T08:44:00","date_gmt":"2011-04-19T22:44:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2011\/04\/20\/new-hamstack-project-boards-from-sierra-radio-systems\/"},"modified":"2025-07-21T19:51:46","modified_gmt":"2025-07-21T09:51:46","slug":"new-hamstack-project-boards-from-sierra-radio-systems","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2011\/04\/20\/new-hamstack-project-boards-from-sierra-radio-systems\/","title":{"rendered":"New HamStack Project Boards from Sierra Radio Systems"},"content":{"rendered":"

\"\"<\/a>From Sierra Radio Systems (our sponsor):<\/span><\/p>\n

We just got a batch of new boards that are a very handy companion to the HamStack CPU board. We call it a “Project Board”. If you are embedding a CPU board into your own project, that works fine. However, if you want to build a stand-alone application, like a keyer, sequencer, DTMF decoder, reset timer, tone generator, whatever, you will need a power supply, connectors and some sub-circuits. That is what the project board includes. You plug the CPU board on top of the project board and you can program it to do all kinds of things.<\/span><\/p>\n

The board includes the following sub-circuits…<\/span>
Features<\/span>
– 2 digital inputs with 10 pullup resistors to +5v DC<\/span>
– 4 analog inputs with a selectable voltage range of 0-5 or 0-22 volts DC<\/span>
– 3 high speed, quiet, SPST reed relays capable of switching up to 500 ma.<\/span>
– 1 opto isolated digital output<\/span>
– 1 RS-232 <\/span>serial port<\/span>
– 1 <\/span>analog signal output<\/span> that can generate a sine wave 0-5kHz at 0-5v DC<\/span>
– 8870 DTMF decoder chip<\/span>
– 1 <\/span>Temperature probe input<\/span>
– 3 additional <\/span>general purpose CPU<\/span> IO connections<\/span>
– 5v <\/span>DC power supply<\/span> (supply rail for logic and <\/span>analog chips<\/span>)<\/span>
– 2.5v DC power supply (bias supply for op amps)<\/span>
– 3.3v DC power supply (supply rail for 3.3v parts)<\/span>
– 5 pole low pass filter to condition the <\/span>analog signal generators<\/span> output<\/span><\/p>\n

Ideas…<\/span>
For repeater builders, you can use the DTMF decoder and relays to make a master site reset controller that sits outside the repeater controller.<\/span>
You can use the tone generation function to make a portable or bench top test tone generator.<\/span>
You can use the reed relays to do timer based computer resetting.<\/span>
Make a CW IDer or beacon transmitter controller.<\/span>
Battery voltage monitor. Read the voltage, when low, one of the reed relays keys the repeater transmitter and the tone generator send a beep or CW message. <\/span>
Plus…<\/span>
We are writing a really cool keyer app that will do iambic mode A\/B, record and send programmable macros, with an LCD to show the speed and use a digital rotary encoder to set the speed.<\/span>
The keyer will be open source and you can hack it to your hearts content.<\/span><\/p>\n

Anyway, its the perfect platform to build a HamStack based <\/span>ham radio project<\/span>. The HamStack (and project board) supports programming in C or Basic. <\/span><\/p>\n

Check it out on the web site <\/span>www.hamstack.com<\/span><\/a><\/p>\n

George<\/span>
KJ6VU<\/span>
<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

From Sierra Radio Systems (our sponsor): We just got a batch of new boards that are a very handy companion to the HamStack CPU board. We call it a “Project Board”. If you are embedding a CPU board into your own project, that works fine. However, if you want to build a stand-alone application, like … Continue reading “New HamStack Project Boards from Sierra Radio Systems”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":5930,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38],"tags":[],"class_list":["post-5929","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-parts-suppliers"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/5929","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/comments?post=5929"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/5929\/revisions"}],"predecessor-version":[{"id":5931,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/5929\/revisions\/5931"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/5930"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=5929"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=5929"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=5929"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}