Oldbod wrote:I want to capture pressure sensor readings (0-3bar, resolution 0.05bar, air/helium, operating temp range -30c to plus 30c, low humidity) at a sample rate of perhaps 30+/sec. (happenings inside a low rpm pneumatic system). My best bet looks like it might be an analog sensor, but with the single adc... Does anybody have digital or other suggestions that might fit the bill please? Talking of which, upper limit probably about £15-20.. now you see the difficulty..
Any ideas very gratefully received, including use a chip with multiple adc's...
Hi,
I have designed a board for the 1.1" wide ESP8266 NodeMCU-12 module or the .9" wide DOIT ESP8266-12 module. It uses the MCP23017 16-bit I/O expander and the ADG715 8:1 analog mux. chip to greatly expand I/O capability. Only the default SCL and SDA pins are required from the ESP module. All inputs & outputs are protected against overvoltage and the board has its own 5V and 3.3V regulators to power the ESP8266 module and any extra remote sensors etc., assuming they can run off 3.3V. Each I/O signal has its own GND and 3.3V pin (0.1" pitch). Molex crimp or mini-screw terminal. Don't have a price yet. Still waiting for my pick & place machine to arrive.
I only have 10 prototypes but expect 50, 4-layer production boards to be available in about a month. The board measures 3" x 3.5" (77mm x 88mm). Just getting back into selling on E-Bay after a 1 year absence. The board there is a different board but gives an idea of our style of design.
http://www.ebay.co.uk/usr/tirna_electronicsWould this board be helpful?
Posted: Thu Mar 02, 2017 3:37 pm