Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you may not be able to execute some actions.

Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).

Need help finding load cell, order qty would be > 32,000 units

load_cell_hunter last edited by
I work for a large company that is interested in using load cells to help solve one of our problems. Order qty would exceed 32,000 units. I have been searching for a load cell that meets the below parameters but haven't been able to find a source yet.

Parameters:
- IP67+ (hermetic seal preferred)
- Operable up to 85 Celsius
- Range: 10-20kg
- bending beam or shear beam
- cost: < $100/unit
- output: I2C preferred, analog fine if not
- preference: manufacturer offers calibration services
I realize $100 is extremely cheap considering the parameters I provided, but it's what we need considering the order qty. I have been looking for weeks to no avail. At this point I'd even offer a decently-sized cash reward to anyone who can help me find it. Thanks in advance!!
Reply Quote 0
1 Reply Last reply

1
Posts

8
Views

Suggested Topics

Over the air updates
General Discussion • • ToSa

87

1
Votes

87
Posts

50410
Views

I would really like to get OTA working here as it's freezing outside and I have to go there to update the software in the greenhouse control system. So please, can we have a 'how to' step-by-step guide to OTA? Please? S.
hlk-pm01 are to noisy for rfm69?
Hardware • • Tmaster

5

0
Votes

5
Posts

27
Views

@Tmaster Never assume the original PCB was just a circuit of components, the PCB can incorporate RF shields and antenna radio ground planes...
Does MySensors require Arduino Timer 2?
Hardware • mysensors interrupt nano interrupts esp • • OldSurferDude

2

0
Votes

2
Posts

21
Views

I have success! (oops, that's suppose to be Timer1) I only sample for 1/60 of a second. What I did was to back up all the timer registered I used and then resorted them after I was done sampling. (As opposed to initializing the registers in setup and then starting the timer when needed.) Now I have a Nano sampling the data and sending it to a MySensors Gateway on an RPi3B+ which then sends it to an MQTT broker runing on an old laptop. Also running on the laptop is Home Assistant running inside of VirtualBox. If MySensors does use Timer1, it appears that restoring the registers allows it to be shared. //------------------------------------------------------ISR ISR(TIMER1_OVF_vect){ // interrupt service routine for overflow TCNT1 = TimerPreloadValue; // must be first line! starts the timer counting again digitalWrite(TRIGGER_START_SAMPLE_PIN,HIGH); samplesVolts[--sample]=analogRead(VOLTS_IN_PIN); // decrement before capturing samplesCurrent[sample]=analogRead(CURRENT_IN_PIN); digitalWrite(TRIGGER_START_SAMPLE_PIN,LOW); if (!sample){ // count down to zero digitalWrite(TRIGGER_START_SAMPLE_PERIOD_PIN,LOW); // indicate that sampling is complete samplingEnd = micros(); TCCR1B &= 248; // turns off timer } } //------------------------------------------------------sampleOneCycle void sampleOneCycle(){ // back up timer registers uint8_t TCNT1_b = TCNT1; uint8_t TCCR1B_b = TCCR1B; uint8_t TCCR1A_b = TCCR1A; uint8_t TIMSK1_b = TIMSK1; // configure timer which starts the sampling noInterrupts(); // disable all interrupts TCCR1A = 0; TCCR1B = 0; TCNT1 = TimerPreloadValue; // preload timer //TCCR1B |= (1 << CS10)|(1 << CS12); // 1024 prescaler TCCR1B &= 248; // turns off timer? TIMSK1 |= (1 << TOIE1); // enable timer overflow interrupt ISR // demark sampling sample = NUMBER_OF_SAMPLES; // count down to zero digitalWrite(TRIGGER_START_SAMPLE_PERIOD_PIN,HIGH); samplingStart = micros(); TCNT1 = 65535; // first trigger right away! TCCR1B |= 1; // turns on timer interrupts(); // enable all interrupts // wait for sampling to be complete while(digitalRead(TRIGGER_START_SAMPLE_PERIOD_PIN)){}; samplingEnd = micros(); // restore timer registers TCNT1 = TCNT1_b; TCCR1B = TCCR1B_b; TCCR1A = TCCR1A_b; TIMSK1 = TIMSK1_b; }
Best VOC sensor for detecting a wide range of VOC's?
Hardware • • NeverDie

3

1
Votes

3
Posts

31
Views

@eiten I haven't yet made any progress on finding a good VOC sensor, but along the way I did find out something interesting regarding CO2: namely, if you sleep with your bedroom door closed at night, then the odds are good that the CO2 levels rise to surprisingly high and unhealthy levels. The better CO2 sensors are factory calibrated and never again need recalibration for the life of the sensor (usually around 10 years or so), because they are used in HVAC systems to control fresh air intake to guarantee indoor air quality. As a for instance, here is one such CO2 sensor: https://www.digikey.com/en/products/detail/senseair/006-0-0008/15790694 At around $50 for just the sensor element itself, it's not exactly cheap, but then again, I'd say it's worth it, because who wants to be burdened by remembering to calibrate their CO2 sensors? Ideally, I'd like to find a sensitive VOC sensor that also will never require calibration. Nearly all, and maybe all, of the off-the-shelf IAQ montoring stuff that you might buy for, say, $300 or less seems to require periodic calibration. For that reason, this might be one of those occasions where build is rather than buy.
Best time of year to buy higher quality small project solar panels?
Hardware • • NeverDie

5

1
Votes

5
Posts

70
Views

It probably has to do with fewer people buying them once summer ends, so companies might lower prices to clear out stock before winter.
Sensors and more
Hardware • • Robert Leverett

1

0
Votes

1
Posts

15
Views

No one has replied

Need help finding load cell, order qty would be > 32,000 units

Suggested Topics

Over the air updates
General Discussion • • ToSa

hlk-pm01 are to noisy for rfm69?
Hardware • • Tmaster

Does MySensors require Arduino Timer 2?
Hardware • mysensors interrupt nano interrupts esp • • OldSurferDude

Best VOC sensor for detecting a wide range of VOC's?
Hardware • • NeverDie

Best time of year to buy higher quality small project solar panels?
Hardware • • NeverDie

Sensors and more
Hardware • • Robert Leverett

4
Online

11.4k
Users

11.1k
Topics

112.7k
Posts

Need help finding load cell, order qty would be > 32,000 units

Suggested Topics

Over the air updates General Discussion • • ToSa

hlk-pm01 are to noisy for rfm69? Hardware • • Tmaster

Does MySensors require Arduino Timer 2? Hardware • mysensors interrupt nano interrupts esp • • OldSurferDude

Best VOC sensor for detecting a wide range of VOC's? Hardware • • NeverDie

Best time of year to buy higher quality small project solar panels? Hardware • • NeverDie

Sensors and more Hardware • • Robert Leverett

4Online

11.4kUsers

11.1kTopics

112.7kPosts

Over the air updates
General Discussion • • ToSa

hlk-pm01 are to noisy for rfm69?
Hardware • • Tmaster

Does MySensors require Arduino Timer 2?
Hardware • mysensors interrupt nano interrupts esp • • OldSurferDude

Best VOC sensor for detecting a wide range of VOC's?
Hardware • • NeverDie

Best time of year to buy higher quality small project solar panels?
Hardware • • NeverDie

Sensors and more
Hardware • • Robert Leverett

4
Online

11.4k
Users

11.1k
Topics

112.7k
Posts