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</o:shapelayout></xml><![endif]--></head><body lang=FR-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-CA style='color:#1F497D'>I found the BMP280 which seems to be I2C and SPI compatible..<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=FR style='font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:FR-CA'>De :</span></b><span lang=FR style='font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:FR-CA'> Synth-diy [mailto:synth-diy-bounces@synth-diy.org] <b>De la part de</b> Jean-Pierre Desrochers<br><b>Envoyé :</b> 19 mars 2021 11:10<br><b>À :</b> synth-diy@synth-diy.org<br><b>Objet :</b> [sdiy] Very cheap SPI pressure sensors.. anybody ??<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoPlainText><span lang=EN-CA>I'm looking for very cheap SPI pressure sensors (around $1.00 a piece or less)<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'>For a future project. The pressure value doesn't matter but the size and cost do.<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'>I will need around 90 of these sensors.<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'>For example I found this:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA>BMP180 GY-68 GY68 3.3V 5V BMP-180 Temperature Pressure Sensor Module Barometric IIC I2C Interface Sensor Module Replace BMP085 $0.90CAD<o:p></o:p></span></p><p class=MsoNormal><a href="https://www.aliexpress.com/item/32832330585.html?src=google&albch=shopping&acnt=708-803-3821&isdl=y&slnk=&plac=&mtctp=&albbt=Google_7_shopping&aff_platform=google&aff_short_key=UneMJZVf&&albagn=888888&isSmbAutoCall=false&needSmbHouyi=false&albcp=7386552844&albag=80241711349&trgt=743612850714&crea=en32832330585&netw=u&device=c&albpg=743612850714&albpd=en32832330585&gclid=CjwKCAjw9MuCBhBUEiwAbDZ-7mU2hTS0J2DLxvsPsj8F40L-zV8vtApw9ds_ks1c2Qjg7dLiKgsy3RoCq-EQAvD_BwE&gclsrc=aw.ds"><span lang=EN-CA>https://www.aliexpress.com/item/32832330585.html?src=google&albch=shopping&acnt=708-803-3821&isdl=y&slnk=&plac=&mtctp=&albbt=Google_7_shopping&aff_platform=google&aff_short_key=UneMJZVf&&albagn=888888&isSmbAutoCall=false&needSmbHouyi=false&albcp=7386552844&albag=80241711349&trgt=743612850714&crea=en32832330585&netw=u&device=c&albpg=743612850714&albpd=en32832330585&gclid=CjwKCAjw9MuCBhBUEiwAbDZ-7mU2hTS0J2DLxvsPsj8F40L-zV8vtApw9ds_ks1c2Qjg7dLiKgsy3RoCq-EQAvD_BwE&gclsrc=aw.ds</span></a><span lang=EN-CA><o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'>But because I need 90 devices and the BMP180 is I2C and has only one address value<br>I would need somekind of multiplexer to address 90 devices (one at the time obviously).<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'>So.. SPI devices would fit better here.<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'>One other possibility would be to use this type:<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'>MPS20N0040D MPS20N0040D-D Sphygmomanometer Dip Air Pressure Sensor 0-40kPa DIP-6 For Arduino Raspb $0.74CAD<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'><a href="https://www.aliexpress.com/item/4000354356373.html?src=google&albch=shopping&acnt=708-803-3821&isdl=y&slnk=&plac=&mtctp=&albbt=Google_7_shopping&aff_platform=google&aff_short_key=UneMJZVf&&albagn=888888&isSmbAutoCall=false&needSmbHouyi=false&albcp=9604672960&albag=100679328364&trgt=296904913880&crea=en4000354356373&netw=u&device=c&albpg=296904913880&albpd=en4000354356373&gclid=CjwKCAjw9MuCBhBUEiwAbDZ-7kff0q--0F6YUo73aVqE_HAtqkRyIslFbEMRTWz7QICR2szctlC7zxoCrMUQAvD_BwE&gclsrc=aw.ds">https://www.aliexpress.com/item/4000354356373.html?src=google&albch=shopping&acnt=708-803-3821&isdl=y&slnk=&plac=&mtctp=&albbt=Google_7_shopping&aff_platform=google&aff_short_key=UneMJZVf&&albagn=888888&isSmbAutoCall=false&needSmbHouyi=false&albcp=9604672960&albag=100679328364&trgt=296904913880&crea=en4000354356373&netw=u&device=c&albpg=296904913880&albpd=en4000354356373&gclid=CjwKCAjw9MuCBhBUEiwAbDZ-7kff0q--0F6YUo73aVqE_HAtqkRyIslFbEMRTWz7QICR2szctlC7zxoCrMUQAvD_BwE&gclsrc=aw.ds</a><o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'>But I’ll need some analog IC to manage the output..<o:p></o:p></span></p><p class=MsoPlainText><b><u><span lang=EN-CA style='color:black'>Again the part’s pressure specs value do not matter.. I will manage a way to use it.<o:p></o:p></span></u></b></p><p class=MsoPlainText><span lang=EN-CA style='color:black'>but the size and cost do.<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'>So far the best would be a SPI equivalent of the BMP180 IC..<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'>Let me know if someone googled something I did not spot !<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='color:black'>JP<o:p></o:p></span></p></div></body></html>