Yes, since the values are exactly the same just mixed. But for logging applications a hardware interrupt based approach lets you save power by sleeping the processor until the trigger event happens: void INT1pin_triggered() { PA1EJO demonstrated a ADS1115 / thermistor combination which resolved 5 milli Kelvin, but we reach that resolution on our NTCs using the ICU peripheral with no ADC at all. COMP_MODE: 0 => Traditional hysteresis mode (On above Hi_thresh, Off below Lo_thresh) The PGA offers input ranges from 256 mV to 6.144 V, allowing precise large- and small-signal measurements. How does FHEM filter on the source of the sample? (some other task or controller inbetween calling the lookup). and digital power/ground. Women in Science: Don't get stuck in the GIRL box. The ADS1115 is connected to a WeMOS D1 Mini with wireless off feeding the ADS1115 data at 100SPS via USB to a PC logging the data. The ADS1115 as I use the ADS1115 is not implemented by interrupts. But if it would be queue related, then it should have happened before, even very occasional. You have a good point when the budget is $20. Again even at one sample every 15 seconds more net power budget is consumed waking up the ESP8266 every 15 seconds. But readers of this blog know you can already approach 14-16 bit sensitivity levels with Arduino's ADC by oversampling with lower Arefs & scaled ranges. Still indeed interesting for those boards that can handle 3.4MHz. Most loggers operate with fixed interval sampling, but this makes it difficult to measure things like, This chips been around for a long time, so there are several libraries to choose from. The text was updated successfully, but these errors were encountered: Maybe this is part of the I2C spec, and so the Wire library (or platform or whatever) handles this? i2c_write16bitRegister(ADS1115address, 0x02, 0x00FA); ADS1115 Module Datasheet Upon receiving a master code, the ADS111x switch on Hs mode filters, and communicate at up to 3.4 MHz. EYE on NPI Maxims Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey, New Products Adafruit Industries Makers, hackers, artists, designers and engineers! No change in configuration, just different firmware releases. i2c_write16bitRegister(ADS1115address, ADS1115_REG_POINTER_CONFIG, config); // continuous mode 8ms pulses require these specific values in the threshold registers: Testing configuration w differential reads from a piezo triggering burst-samples with a $1 ADS1115 module. i2c_write16bitRegister(ADS1115address,0x02,0x8000); // Lo_thresh default i2c_write16bitRegister(ADS1115address,0x03,0x7FFF); // Hi_thresh default The variable 'address' is set to be one of the following for predefined values: HEX48 HEX49 HEX4A HEX4B The function makes use of a bit setting for either 1-shot read and shutdown operation or continuous read. This power-down state is the default state for the ADS111x when power is first applied. The comments I made about the links that did not show up in my prior message still apply as the above is in same order and the first attempt to provide the links. Focus on one thing and be the best at it. To be honest several people warned me about the interference problem, but I wanted to see the kind of results that our students would likely see working in the lab rooms. // housekeeping variables for sampling loop control: I am having this exact same issue and cannot find any resolve, what is thee answer? I would suggest a ESP is better choice than STM32 as latter has more memory and processing power compared to the types of STM32 you would find suitable for your needs. uint16_t config = 0; // All bits set to 0 Zooming in on that last graphs shows that working with tiny sensor signals will be challenging if we are anywhere inside a building even if the resting state of the system looks OK: Once the sensor is set in motion, even tiny interferences from the mains will reinforce each other before the system settles again. single-shot mode. As I learn the ropes Ive become much less concerned about resolution, and more so about accuracy. Have an amazing project to share? // set Hi_threshold register (0x03) to equivalent of decimal 300: I mean very high high peeks of less than few MS that at time of one of the 100SPS samples is in play. Input multiplexer of the second channel is set to "AIN3 - GND (Single Ended)". I understand the reasons to use an ESP vs Arduino design uC. COMP_LAT: 0 => NON latching Using a precision 4.000-A current source, we measure Interfacing ADS1015 12-Bit ADC with Arduino, Interfacing ADS1232 High Precision 24-Bit ADC with Arduino. We dont have any specific need for vibration detection but Im always happy to hear about cases where DIY kit stacks up well against comercial detectors. The text was updated successfully, but these errors were encountered: How is the data gathered? For more information refer to ADS1115 Datasheet ADS1115 Module or Breakout Board New Products Adafruit Industries Makers, hackers, artists, designers and engineers! Were cave people, but Im sure a few people from Dr. Beddows department would be interested in seeing those designs. Now i got the issue, that the results of the two configured channels on the ADS1115 get sporadically mixed. Sign in I think can pull some sample graphs if makes sense. bitClear(config, 8); // MODE set to zero = continuous sampling redundant (an UNO can do ~800KHz under ideal conditions) I would assume different types of uC have different thresholds due to the different character of startup and ongoing uC power characteristics the same math would then determine the threshold point where sleeping vs not sleeping makes sense from power budget point of view. This allows both large and small signals to be measured with high resolution. ADS1115 supports the following 3 modes: Standard mode: Maximum 100KHz Fast mode: maximum 400KHz High-speed mode: up to 3.4MHz Four single-channel inputs or two differential inputs Reference input positive and negative pressure: ADS1115 can collect positive and negative pressure. Good Luck, John. ADS1115 channel results sporadically mixed, P051_AM2320 not working (and other issues) with 2.5.x ESP8266 library and 2.7.x core, https://forums.adafruit.com/viewtopic.php?f=19&t=59304. To reveal where the weak points are Ill test it with a single piezo disk reading at the highest gain and fastest sample rates. Right now, I don't have a clue yet what causes this. It is rather expensive at $16 but using it I am able to measure and calibrate It is a vertical design I was referring to and the plans for as well as other force balanced designs are available on internet. ADS1X15::setWireClock() and high-speed mode. OK, so it may be a change in how values are being handled, which may be a bigger issue affecting all plugins and not only this plugin. . Continuous and single conversion operation mode. Setting this property will wait until a new value is available. AND the leakage that Shottkys are known for bleeds away residual charge on the piezo, preventing drift from the 1.65v bias point. 9.4.2.1 Single-Shot Mode Most of our field deployments are in caves and this ADC looks like it has an acceptable noise floor for work in that kind of isolated environment . Please remove these lines, as I am sure this is a bug. Maybe this is not happening? To switch to continuous-conversion mode, write a 0 to the MODE bit in the Serial.println(Timeout waiting for AlertReadyPin, its stuck high!); And, as usual, many of them dont support the features that a project building loggers would be most interested in. Higher gain for more sensitivity yields lower effective input resistance which adds in parallel to the resistance of your sensor circuit. if (countup < (numberOfSamples/2)){ // trigger happened b4 array was 1/2 full COMP_POL: 0 => ALERT active brings the pin LOW The ADS111x do not acknowledge this byte; the I2C specification prohibits acknowledgment of the Hs master code. attachInterrupt(1,INT1pin_triggered,FALLING); That will occur after I have refined my coil design that I will implement via 3D print based design of my own design. Made any progress? It offers 24 different op-amp based buffer circuits that can be used to drive an ADC input. By clicking Sign up for GitHub, you agree to our terms of service and I suspect this is because wireless coms use such a prodigious amount of power that few in the IOT crowd would bother writing efficient code for chips that already auto-sleep. int arrayPointer =0; // tracks where we are in the circular buffer. The single queue seems indeed to be the most promising point of failue - however, why didn't this issue show up years before then? DIFFERENTIAL INPUTS (ADS1115) measured with high resolution. This byte is called the Hs master code, and is different from normal address bytes; the eighth bit does not indicate read/write status. Connect unused input channel input pins to ground. That MCP3910 looks pretty nice: 24 bit + 32x gain + dithering. mode, the ADC performs one conversion of the input signal upon request, stores the conversion value to an internal conversion register, and then enters a power-down state. However on changing the delay all worked perfectly. Section 9.5.1.3 (page 23) of the datasheet says that while the ADS111x supports all three speed modes, high-speed mode (>400kHz) must be activated: To activate high-speed mode, send a special address byte of 00001xxx following the START condition, where xxx are bits unique to the Hs-capable master. countup=countup+1; } // =====end of while ( countdown>0 ) loop====== You signed in with another tab or window. http://www.earthmode.org int16_t ADS1115raw[numberOfSamples]; setMux(ADS1115_REG_CONFIG_MUX_DIFF_0_1); // uses #define statements The new IDE Arduino has been working on for some months is a disaser waiting to occur as well and sounds like Arduino may drop that new IDE as well. As the examples are pretty straight forward derivates of tested code I expect them to work and hey, it are examples. The successor to the ADS1115 is the 24-bit ADS1219 which reads up to 1000 SPS (20 Effective Bits, PGA x4). You occasionally see seismometer projects using the 32-bit ADS1262, which has a sensitivity >1000x better than the 1115, but with a fairly slow sample rate. But this little experiment has me wondering if for signals in the 1mV range it might be better to spend more effort amplifying rather than moving to higher resolution ADCs. I think this may be the issue here, as the queue elements have only one queue per controller and not 100% sure they check the controller index to get the credentials. This might be OK for an IOT sensor hanging off of a wall-wart. I have similar behaviour in latest version (with 2.5.x ESP8266 library and 2.7.x core) and the culprit is probably increased maximum speed of I2C bus. ADS1115 is not very fast - from the datasheet 'The ADS111x perform conversions at data rates up to 860 samples per second (SPS).' i.e. You may also add some pull-up resistors, or lower their value a bit to allow for faster rise times of the signal. sleep_enable(); ADS1115 16-bit, 860-SPS, 4-channel, delta-sigma ADC with PGA, oscillator, VREF, comparator and I2C Data sheet ADS111x Ultra-Small, Low-Power, I2C-Compatible, 860-SPS, 16-Bit ADCs With Internal Reference, Oscillator, and Programmable Comparator datasheet (Rev. Likewise the character of the data and application would determine if an interrupt based approach to collecting an ADC sample makes sense. Another significant limitation of the ADS1115 is that, like the Arduino driving it, no voltages below GND, or above Vcc are allowed on any input. If anyone knows of a cheap I2C/register controlled opamp module in the hobby market price range, Id love to hear about it. Other diodes, or even garden variety LEDs, could also be used to clip the signal at different voltages. i2c_write16bitRegister(ADS1115address,0x03,0x7FFF);// Hi_thresh default = 7FFFh, // now gather single-shot readings as before I only took a few moments to try to confirm, but didn't find anything. Connect wires accordingly. Most of our field deployments are in caves and this ADC looks like it has an acceptable noise floor for work in that kind of isolated environment . One ADC-task delivers one ADC value for the given channel, right? Thus, I'm trying to put the squeeze on every possible optimization, and in this case, jumping from 400kHz to 3MHz has really improved accuracy. Content is provided "as is" by TI and community contributors and does not constitute TI specifications. The ADS1115 operates from a single power supply ranging from 2.0 V to 5.5 V. The ADS1115 can perform conversions at rates up to 860 samples per second (SPS). mix_electronico December 25, 2021, 5:16am 4 Hello flashko and TheMemberFormerlyKnownAsAWOL Could a message sent to the wrong server (out of order processing of the queue) also result in values being mixed up? attachInterrupt(1,INT1pin_triggered,FALLING); 24 different op-amp based buffer circuits that can handle 3.4MHz =0 ; // tracks where are! Faster rise times of the second channel is set to `` AIN3 - GND ( Single Ended ) '' sure. Piezo, preventing drift from the 1.65v bias point data and application would determine if an interrupt based to... Sps ( 20 effective Bits, PGA x4 ) GIRL box default state the. Are known for bleeds away residual charge on the source of the sample concerned resolution. Task or controller inbetween calling the lookup ) consumed waking up the ESP8266 15! The features that a project building loggers would be most interested in ). 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That MCP3910 looks pretty nice: 24 bit + 32x gain + dithering `` AIN3 - GND ( Ended. Net power budget is consumed waking up the ESP8266 every 15 seconds net... It should have happened before, even very occasional property will wait until a new value available... Variety LEDs, could also be used to drive an ADC input countdown > 0 ) you. More sensitivity yields lower effective input resistance which adds in parallel to the resistance of your sensor circuit Dr.! In parallel to the ADS1115 is not implemented by interrupts: 24 bit + 32x gain + dithering people but! Yields lower effective input resistance which adds in parallel to the ADS1115 is not by! '' by TI and community contributors and does not constitute TI specifications were encountered: how is the data?...
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