PCF8591 and module specifications<\/strong><\/p>\n The DAC output is available at Inputs Three onboard jumpers connect the sensors to input channels. Remove the relevant jumper to use that channel as a general-purpose input:<\/p>\n The LDR responds to changes in light. Less light increases the voltage read on channel 0. Readings are relative and are not calibrated absolute light-intensity measurements.<\/p>\n The thermistor resistance changes with temperature. A temperature decrease raises the voltage on channel 1, according to the source. Its exact specification is not provided, so use it for relative temperature changes unless you characterize and calibrate it empirically.<\/p>\n The onboard 10 k\u03a9 potentiometer is connected between VCC and GND, with its wiper connected to channel 3. Turning it varies the channel-3 voltage between 0 V and VCC; clockwise rotation lowers the voltage, according to the source. It can be used as a general-purpose analog control input.<\/p>\n If the module is powered at 5 V, verify that the I\u00b2C pull-up voltage is safe for the connected controller; use suitable level shifting where required. Confirm analog input range and output levels before connecting other equipment.<\/p>\n Connect VCC and GND to a suitable supply and the microcontroller. Connect I\u00b2C SCL and SDA to the matching bus lines.<\/p>\n 1 \u00d7 4 I\u00b2C header<\/strong><\/p>\n 1 \u00d7 5 analog header<\/strong><\/p>\n NXP lists the PCF8591 IC as discontinued; specifications remain available in its datasheet. Verify the fitted chip and board revision.<\/p>\n NXP PCF8591 product information<\/a> \u00b7 Official PCF8591 datasheet<\/a><\/p>\n","protected":false},"excerpt":{"rendered":" PCF8591 I\u00b2C module with four 8-bit analog inputs, one 8-bit DAC output, and onboard LDR, thermistor and potentiometer. Select revision A or B.<\/p>\n","protected":false},"featured_media":58351,"template":"","meta":[],"product_brand":[],"product_cat":[314,316],"product_tag":[],"class_list":["post-58350","product","type-product","status-publish","has-post-thumbnail","product_cat-developpement-en","product_cat-modules-capteurs-en","first","instock","taxable","shipping-taxable","purchasable","product-type-variable"],"yoast_head":"\n\n
DAC analog output<\/h4>\n
AOUT<\/code> and has 256 output steps. At a 5 V supply, one nominal step is 5 V \u00f7 256, approximately 20 mV. The board connects an LED and 1 k\u03a9 resistor to the DAC output; this load limits the output swing. The source estimates a maximum of about 4.2 V at VCC = 5 V. For a larger output swing, the source recommends removing the LED load. The DAC is also used internally during ADC operation; an internal track-and-hold circuit maintains the output value.<\/p>\nADC analog inputs<\/h4>\n
AIN0<\/code>\u2013AIN3<\/code> are available at the header. They operate as four single-ended, ground-referenced inputs by default. The PCF8591 also supports two differential inputs; consult the datasheet for that configuration.<\/p>\n\n
AIN0<\/code>)<\/li>\nAIN1<\/code>)<\/li>\nAIN3<\/code>)<\/li>\nAIN2<\/code>) has no onboard sensor connection and needs no jumper adjustment.<\/li>\n<\/ul>\n![\"PCF8591](\"https:\/\/protosupplies.com\/wp-content\/uploads\/2020\/10\/PCF8591-AD-and-DA-Converter-Module-Jumpers.jpg\")
<\/p>\nLDR<\/h4>\n
![\"PCF8591](\"https:\/\/protosupplies.com\/wp-content\/uploads\/2020\/10\/PCF8591-AD-and-DA-Converter-Module-LDR.jpg\")
<\/p>\nThermistor<\/h4>\n
![\"PCF8591](\"https:\/\/protosupplies.com\/wp-content\/uploads\/2020\/10\/PCF8591-AD-and-DA-Converter-Module-Thermistor.jpg\")
<\/p>\nPotentiometer<\/h4>\n
![\"PCF8591](\"https:\/\/protosupplies.com\/wp-content\/uploads\/2020\/10\/PCF8591-AD-and-DA-Converter-Module-Potentiometer.jpg\")
<\/p>\nI\u00b2C interface<\/h4>\n
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0x48<\/code>. The source says all three IC address pins are tied to ground on this module, so the address cannot be changed.<\/li>\nConnections<\/h4>\n
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