From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM autolearn=unavailable autolearn_force=no version=3.4.4 X-Received: by 2002:a37:8c7:: with SMTP id 190mr21339545qki.373.1561449534568; Tue, 25 Jun 2019 00:58:54 -0700 (PDT) X-Received: by 2002:a05:6808:313:: with SMTP id i19mr13374856oie.30.1561449533966; Tue, 25 Jun 2019 00:58:53 -0700 (PDT) Path: eternal-september.org!reader01.eternal-september.org!feeder.eternal-september.org!weretis.net!feeder6.news.weretis.net!feeder.usenetexpress.com!feeder-in1.iad1.usenetexpress.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!m24no2866520qtm.0!news-out.google.com!e20ni48qta.0!nntp.google.com!m24no2866508qtm.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail Newsgroups: comp.lang.ada Date: Tue, 25 Jun 2019 00:58:53 -0700 (PDT) In-Reply-To: <877e9a4hvk.fsf@nightsong.com> Complaints-To: groups-abuse@google.com Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=80.87.63.33; posting-account=XGCYegoAAADY19DGgU_zTfTSbVlfUJ_a NNTP-Posting-Host: 80.87.63.33 References: <36947344-5a17-46ca-9dbb-f795ce1f7c86@googlegroups.com> <877e9a4hvk.fsf@nightsong.com> User-Agent: G2/1.0 MIME-Version: 1.0 Message-ID: <7a6272dc-5de0-48a0-8eec-7db3a2e4022a@googlegroups.com> Subject: Re: Which embedded devices do you use? From: Philip Munts Injection-Date: Tue, 25 Jun 2019 07:58:54 +0000 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Xref: reader01.eternal-september.org comp.lang.ada:56748 Date: 2019-06-25T00:58:53-07:00 List-Id: I don't have my engineering notebook with me and so I'm working from memory= . I recall measuring 70 mA for a Raspberry Pi Zero (not Wireless). That's= idle sitting at a command line and is pretty consistent with this site: https://www.jeffgeerling.com/blogs/jeff-geerling/raspberry-pi-zero-power I haven't measured a PocketBeagle's current consumption, but I imagine it w= ould be similar. A very quick scan of Google search results suggests 80 mA= or so. It would be a very interesting experiment to downclock a Pi Zero as much as= possible to see how much power consumption can be reduced. As it is, I sometimes run Raspberry Pi's on some 1000 mAh Lithium USB batte= ries for classes and demonstrations and that would yield on the order of 1= 0 hours for a Raspberry Pi Zero. One challenge to reducing power performance is actually the on-board RAM, w= hich often consumes a large fraction of the power budget. Both the Raspber= ry Pi Zero and PocketBeagle, with 512 MB of RAM, are at sort of a sweet spo= t for performance, space, power consumption, and cost. There are Linux computer modules that are smaller, like the LinkIt Smart 76= 88, with less RAM and potentially lower power consumption, but then it gets= really hard to fit interesting and useful software.