A 3.3v Pro Mini based build @8MHz would not have kept up unless I used SLEEP_MODE_IDLE to keep the main oscillator running which avoids that long stabilization delay. The ADS1115 also features an input multiplexer (MUX) that provides two differential or four single-ended inputs. for (uint32_t i = 0; i<100000; i++) { Description This library should work for the devices mentioned below, although not all sensors support all functionality. My past searches for such beasts usually finds them in the $5 each price range each for the small quantities we use. The only way I can explain why it only now turns up in your setup is that there may have been some code optimizations which cause both plugins to try to read the names of taskname or taskvalue names right after each other, where they didn't before. } Standard mode allows a clock frequency of up to 100kHz; fast mode permits a clock frequency of up to 400kHz; and high-speed mode (also called Hs mode) allows a clock frequency of up to 3.4MHz." config |= ADS1115_REG_CONFIG_DR_475SPS ; DIFFERENTIAL INPUTS (ADS1115) measured with high resolution. 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. i2c_write16bitRegister(ADS1115address, 0x03, 0x8000); //Hi_thresh MS bit must be 1, // ALRT/RDY output from ADC is connected to the hardware INT1 pin To reveal where the weak points are Ill test it with a single piezo disk reading at the highest gain and fastest sample rates. Bridge arrangements automatically bias to the mid-point, so while the tie-in points might go negative relative to each other, they are still positive relative to GND on the ADC. To download the datasheet of ADS1115 module, click here. ADS1115 Module Datasheet Once can build a force balanced seismic instrument, but I suspect they may have challenges in a moist cave conditions. Next I tried a run from batteries only, with the nearby electrical devices all turned off. Join us every Wednesday night at 8pm ET for Ask an Engineer! 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. 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. int countup = 0; // If triggered before the array is 1/2 full, countup used to fill remaining It's a MicroMod RP2040 (SparkFun's version of the Raspberry Pi Pico) mounted to a custom PCB which has multiple ADS1114s. Addendum 2020-05-24: Interrupt latency with wake from sleep. 144, 430/440, 1200 MHz ALL MODE TRANSCEIVER | The SD card shown in the photo is not supplied. And 475 samples-per-second is not quite fast enough to show piezo sensor behavior. INT1_Flag = false; // reset the flag before the do loop Task 1 does sometimes get values configured from the input configured in task 2 and vice verse. I am surprised there are not mare of these about as a Nano or Uno like product. 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. For more information refer to ADS1115 Datasheet ADS1115 Module or Breakout Board My first thought was This is a well behaved, repeating signal Ill just subtract it out. Have a question about this project? This Supreme VHF/UHF Transceiver Provides a Brand New Experience! config |= ADS1115_REG_CONFIG_PGA_0_256V ; The ADS1115 datasheet actually mentions this, as it normally operates in Fast mode and to activate the high speed mode: No special action is required to use the ADS1113/4/5 the master must first write an appropriate value to the in standard or fast mode, but high-speed mode must be activated. I do not sleep the ESP8266 as the power budget in doing so as well as the delay time to wake up and take a sample when sampling at 100SPs would be far more than leaving the ESP8266 running let alone the associated significant relative delay/overhead time. ADS1115-Q1 Automotive 16-bit, 860-SPS, 4-ch, delta-sigma ADC with PGA, oscillator, VREF, comparator and I2C Data sheet ADS111x-Q1Automotive, Low-Power, I2C-Compatible, 860-SPS, 16-Bit ADCs With Internal Reference, Oscillator, and Programmable Comparator datasheet (Rev. The ADS1115-Q1 features an input multiplexer (MUX) that allows two differential or four single-ended input measurements. Women in Science: Don't get stuck in the GIRL box. Since we use a modules and jumper wires design plan, they are all easy to swap in, though the Pro Mini clones are rapidly approaching $1 for a complete board, so they still have a cost advantage. 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. Maybe this is not happening? If that happens to Arduino too, I wont be at all surprised. config |= _rate; config |= _gain; config |= _mux; // sets matching bits to 1 this 10% oscillator drift I only found in that post, not in the datasheet. Analog (). The ADS1115 breakout board is a high-resolution analog-to-digital converter (ADC) that can be used with various microcontrollers, including Arduino, STM32, and ESP8266/32. I agree it is then unlikely the single queue may be the cause here. Continuous and single conversion operation mode. Almost all microcontrollers come with ADC pins, but they lack high precision. Adafruit IoT Monthly Boxing Glove Tracker, Disconnecting Smart Appliances, and more! Alternatively I could go back to single shot sampling and use the processors internal timers to only request each new sample at some whole number multiple of the 60 Hz mains cycles, like for example at 600 readings a second. If I remember correctly, there was one user a few weeks (months?) John. I am having this exact same issue and cannot find any resolve, what is thee answer? Pingback: Using the ADS1115 in continuous mode for burst sampling gStore. A tap on the desk with a pencil produced a +/- 5mv swing (~640 raw counts), and my breadboard proto circuit is picking up almost 100 counts of mains hum. single-shot mode. #define numberOfSamples 500 A general purpose (100x) LM358 might do the job on its own, or a (1000x) INA333 or AD623 modules (with the trimpot) which can usually be had for less than $6, as can the AD8221AR. Using a precision 4.000-A current source, we measure In this investigation, 80 Gbps data is transmitted on a hybrid FSO and multimode fiber (MMF)-based network using mode division multiplexing of . And since the waiting period is unknown, those readings need to go into a circular buffer that wraps around and stores each new sample over the oldest one in memory. (A faster ADC would be smarter, but I've got a $8k reel of these, so I'm kinda stuck with it. Even prior there were some serious flaws in the development environment that were very simple to address and they would not fix not think of doing so. I am using the example included in the library for differential measure. At this point they really do look like the most likely successor for us especially if Arduino decides to monetize the IDE by locking every one with a cloud-only subscription based IDE. For using I2C ADC with Raspberry pi or other SBC with Linux OS, you can check similar library here. I would favor these over a STM32. while ( countdown>0 ){ The primary attraction is this ADC has differential inputs. In single shot mode, you have to re-write the configuration register every time you want a reading: Myers triggerConversion() function sets the config register with a common Bitwise-OR method. 7.12 Ben-gi ADS1115 16 Bit 16 Byte Gain Amplifier Converter Development Boards Compatible for RPi Pro Arduino: Kitchen & Home . But if it would be queue related, then it should have happened before, even very occasional. Your email address will not be published. i2c_write16bitRegister(ADS1115address, 0x03, 0x012C); // set Hi_thresh = 300. if (countup < (numberOfSamples/2)){ // trigger happened b4 array was 1/2 full Same with really nice polymer capacitors. 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. This module supports multiple devices connected to IC bus. AND the leakage that Shottkys are known for bleeds away residual charge on the piezo, preventing drift from the 1.65v bias point. So maybe switching is not necessary in this special case. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (), Voltage and Current Measurement Reference Design for Automotive On-Board Charger System, This reference design uses our current shunt amplifiers, operational amplifiers (op amp), ADCs and digital isolators to provide current and voltage measurement for an on-board charger in a hybrid-electric/electric vehicle. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. i2c_write16bitRegister(ADS1115address,0x02,0x8000);// Lo_thresh default = 8000h This might be specific to way piezo sensors resonate, but Ive got some homework to characterize the effect before we start building a student lab with this module. using 2 different interrupt pins to get timing per sample on micros level? Do not load too many I2C devices, preferably only one, the ADS1115 on the bus. }, if ( triggerHasHappened ){ //then only fill the last half of the array frequency you can use. Zooming in also shows that the ADC was aliasing through some background signal: RAW ADC output vs Sample Number: ADS1115 & piezo sensor, A0-A1 differential, 475SPS, 16x PGA, 500 samples. Plus, I don't plan on re-spinning these PCBs to accommodate this design. It appears to have changed alot since. The default mode of the ADS1115 is single shot mode where the device wakes up, takes a measurement, and then goes back to sleep. Have a question about this project? So there's roughly 160 usec left for the other steps needed, which is quite close to 8msec. And 5% tolerance is a bit grim. until a 1 is written to the operational status (OS) bit in the Config register. I appreciate your interest and efforts -- in almost every issue in you projects, you're always engaged and helpful, and that's awesome. A dramatic improvement, with the pre-event noise falling below +/- 10 counts. In continuous conversion mode the ADS1115 can alert completion with an 8 msec pulse, but with only one alarm output, the threshold detection will have to be done in software: // in the main loop I also believe that those ADCs that allow oversampling would in many ways miss ms peaks though the oversampling the ADC does before the ADC result is made available to the ADC sample register. The primary attraction is this ADC has differential inputs. I just updated an ESP8266 with an ADS1115 connected to release mega-20200703. ). However, I'm using an ADS1114 to read a 60Hz sine wave -- at 860S/s, the best I can do is about 14 samples per full cycle of the wave. I search for the -P processors you referred to and could not find. Laser micro-grooving has excellent potential to improve the surface properties of metals. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. bool triggerHasHappened = false; Experiment 2: Using the ADS1015/ADS1115. bitSet(EIFR,INTF1); // clear pre-existing system flags on INT1 pin Im not sure what you mean by needing precision resistors and poly caps. noInterrupts (); I will add thermocouple ADCs it to my things to check out list beside the HX711. Seems the limit on reply nesting has been reached hence new base message as my reply. The ADS111x-Q1 devices incorporate a low-drift voltage reference and an oscillator. The -p is usually just left out because so few people care about how many sleep levels a processor supports. Correct - 120s. 0.01-Ohm shunts. This is not as obvious and straight forward as I would like, but is not complex either. The Adafruit library even inserts 8ms delay statements wasting cpu power and throttling the sample rate to 125sps. (an UNO can do ~800KHz under ideal conditions) The successor to the ADS1115 is the 24-bit ADS1219 which reads up to 1000 SPS (20 Effective Bits, PGA x4). I'm using the ESPEasy modul of FHEM which (as far as i understand it) generates a device based on the device name and readings according to the value names received. As you can see, the config is set to 128 samples/sec. To measure the voltage more accurately, you need to adjust the GAIN. Due to luck I saved a text copy of my last message so I still have the select few links as sample of project that allows one to build a seismometer as good as those used in seismic observatories. We tend to avoid SPI sensors just to keep the bus free for the SD cards in our loggersbut that chip is tempting. Its one reason why I keep developing non-standard calibration methods Im trying to roll a multitude of tempco errors from the cheap crappy parts we do use into the constants, rather than using precision refs. This minimalist approach uses only two main functions: triggerConversion() Sets config register bits & then writes that register back to the sensor (which automatically starts a single-shot reading) The ADS1115 auto-sleeps after the reading. EDIT: Oh, and I almost forgot: Do you sleep the ESPs while gathering the ADC readings with a similar interrupt method? A typical combination would be atwo element varying bridge, and an inexpensive voltage reference like theLM4040, or theTL431. EYE on NPI Maxims Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey, New Products Adafruit Industries Makers, hackers, artists, designers and engineers! Again even at one sample every 15 seconds more net power budget is consumed waking up the ESP8266 every 15 seconds. That bit change breaks the loop, and getConversion then reads the 16-bit output register. I found that changing the Delay on line 184 from 8 to 9 fixed the issues I have had, I'd read something about this on the Adafruit forums. ADS1115 Features: WIDE SUPPLY RANGE: 2.0V to 5.5V LOW CURRENT CONSUMPTION: Continuous Mode: Only 150A Single-Shot Mode: Auto Shut-Down PROGRAMMABLE DATA RATE: 8SPS to 860SPS INTERNAL LOW-DRIFT VOLTAGE REFERENCE INTERNAL OSCILLATOR INTERNAL PGA I2C INTERFACE: Pin-Selectable Addresses FOUR SINGLE-ENDED OR TWO DIFFERENTIAL INPUTS triggerConversion(); // resets the config register to single shot mode every cycle it was meant to point out the aggregate time of threshold point the ADC is set to identify an event of interest, time takes to wake the uC, uC post wake up processing, the uC ISR processing time (CPU and ISR routine), et al. when I check it about week ago I had not tried to use the STM32 Arduino development environment for few years. Force balanced seismic instruments that are in the order of 28,300 V/m/s vs 28V/m/s of common geophones or 85V/m/s for high gain geophones. 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