Michal Choma

hello, i dont understand wifi credentials, nodemcu is connected to some access point, or it create access point itself? (in setup I usually write soft_AP for access point). Do I need internet connection through router?

sorry, I dont know. But in general, sensors consumpt not much current, lets say 1 mA/sensor.

hello, i dont know. I think best is testing with multimeter. It is possible to damage battery because TP4056 will always pump battery with current?

and I think, better TP4056 module is version with 4 output pins, 2 pins for load, 2 pins for battery. So battery can be fully charged and load will be powered from solar cell.

I dont know if it will work. That is about 1 meter.

hello, I think, output from sensor depend also on input voltage, in my case it was 3.3 V. I dont calibrate system, it is pretty hard.

Nice tip. I like simple Arduino projects. Check mine, if you want.

Appreciate! Do you want make some measurements together? Contact me. I measure Moon light, cca 100 000 microlux. My group on FB: https://www.facebook.com/groups/1829154687394948/?multi_permalinks=2248302092146870%2C2246812522295827¬if_id=1565703432258256¬if_t=group_activity

http://www.xpablo.cz/?p=678

ehm, you mean something like this? This equipment measures intensity and radiation.In laboratory classes with students we need to measure the wavelength.How to incorporate the wavelength measurement to this device?Then answer is: It is very hard to measure wavelength of light source. You mean measure spectrum of light? Like sun, or LED? I can only measure IR, FULL spectrum, in relative units. I think, the good project will be, add UV, IR and VISIBLE light detectors. It should works. Also I find sensor, which can measure what wavelengths can object absorb. https://learn.sparkfun.com/tutorials/spectral-triad-as7265x-hookup-guide/all?fbclid=IwAR3OEzOqO4sdi3-5gBWBg4oV7H761-nKQLnkcEq9njSDPbKJA5uswfLhmeM#hardware-overview

Appreciate! I don't know, if it has sense to make projects like that. Sometimes people say me, it looks bad. I make simple projects, with minimum code.

I had problem with esp analog pin. It was not stable. Anyway, I think, the best method is measure input voltage (voltage between VCC and GND of sensor) and analog output (voltage between analog and GND) with INA219.

It is posssible to get exact lux or watts/m2 for ultraviolet spectrum? I mean, if exist any digital sensor with good arduino library? I use for full spectrum MAX44009 which give me lux.

I just add picture to every step. Hmmm, I think it is normally or?

I would like to make similar thing for measure e.g. temperature of heating water for school. It possible to add arrows to move graph left, right?

Thanks, I will try next to add more sensors and use TFT bigger display with SD card logging.

how much Ah or watts has battery (links to aliexpress)?

Hello, very nice and useful thing, but I have problem. I would like to connect BMP280 sensor and use wemos insted of bare ESP8266. I have problem with turn to AP my wemos when I use in code BMP280 sensor. Dont know why. I start normally BME with command "if (!bme.begin()) { Serial.println("Could not find a valid BMP280 sensor, check wiring!"); while (1); }"I dont know how to replace command in your ini function " bool ok = _sensor.begin(SDA, SCL); "it totally doesnt work. Nah.

and how device know exact time of individual measurement? Or doesnt add to every measure time and date?

I do something similar with ThingSpeak. How you calibrate sensor? https://www.instructables.com/Wireless-Moisture-Monitor-ESP8266-Moisture-Sensor/

I do something similar with ThingSpeak. How you calibrate sensor? https://www.instructables.com/Wireless-Moisture-Monitor-ESP8266-Moisture-Sensor/

I do something similar with ThingSpeak. How you calibrate sensor? https://www.instructables.com/Wireless-Moisture-Monitor-ESP8266-Moisture-Sensor/

Hello, very nice library, it is possible one thing: when graph (curve) goes to end of display, it suddenly jump to "new page", all graph missing, and goes fron beginning. It is possible to set, that graph will not missing suddenly, but only first value will miss, and curve will move to left with every new value?

If I understand correct, BLE board save data on own memory, and using smartphone, you can view values, or download them?

One more question. It is chance to find electronics? I mean, if ballon will be catched by some tree it can be find. Also it will be dangerous for electric cables (ehm, high voltage wires.)

and good cover (as transmitter) can be using Sigfox. Dont know, how it works in high altitude, but it has good cover at mountains, nature, far from cities.

I looking something like that, for pumping different liquids to one glass, for physics experiments. https://www.youtube.com/watch?v=utVEQHJQQ5A

Zdravim, chcel by som sa spýtať, či ste riešili nejako s letiskom to, či môžete púštat balon do vzduchu? Netreba nato povolenia? Inak velmi sa mi páči vaš projekt a že som tu stretol Slovákov :D Hello, I would like to ask if you have somehow dealt with the airport if you can let the balloon go into the air? No need for permission? Otherwise, I really like your project.

Yes. But instructable cant be very old.

It is possible via leds. I remove leds, but also, you can try to measure voltage on that places, where leds were. How, I dont know exactly.

I hope you understand, and basically choosing solar panel depend on TP4056, not battery.

It should be better, and I think if is need to use any diode.

why 8 V -> 5V pin on wemos d1 mini is connected to voltage regulator (it is internal on board, which regulate to 3,3 V), so I ask, what is highest voltage, which I can plug.Dont have. I just connect my esp8266 to output of tp4056, and it cant connect to internet.

Wemos - the problem was probably in battery. I connect to 5 V pin (on wemos d1 mini) Li ion battery (3,7 - 4,2 V), so that was why it takes 0,2 mA. If I connect cca 8V, to 5 V pin, probably I will damage wemos.Internet - the problem is , that current is not enough from TP4056 output. Wemos need 500 - 800 mA. I heard, that shorting pins - GND (battery) and GND (output) on TP4056 solve that.

Hello, what wemos d1 mini board do you use? Because mine drain about 0,2 mA during deep sleep. I also, I have problem with charging board. If I use pins (out +; out -), it cant connect to internet (probably not enough current). Thanks.

what is smallest possible difference in temperature?

something like this: https://www.google.sk/search?biw=1680&bih=896&tbm=isch&sa=1&ei=BDkiW9nLG8XfwAKXto-ICQ&q=step+motor+pinout&oq=step+motor+pinout&gs_l=img.3..0i19k1.20059.21542.0.21651.7.4.0.3.3.0.212.527.1j2j1.4.0....0...1c..64.img..0.7.547...0i8i30i19k1j0i30i19k1.0.PFzPHSIJWEQ#imgrc=6AQmBSRWRmatMM:

hello, very nice instructable. I have a question. How I know, how to connect step motor from CD-ROM mechanics to pins to L293d? Have that step motors 5V, GND, signal 1, signal 2 pinout, or it doesnt matter, and all pins on step motor are same?

voltage - input of TP4056 must be higher then 4,2 V so I choose 1.5 times bigger voltage.Current - C-rate law. I just check what usually is charging current for lions battery - it is around 500 mA, but smaller currents are good , too. Also, during summer, the battery is charge fully + as temperature increase, the voltage of battery is higher. I dont want bake battery.

hello, I would like to make water level IR sensor. I think about use tube, where at top I add IR receiver and trasmitter. And bottom of tube, I use some plastic thing to reflect ir wawes. My question is, how accurate is IR? I know it depend on ambient light, so I would like to use total dark (I make plastic roofs on top tube, max. from bottom some light, ).

hello, I interest in esp powering. I know that ESP when connect to wifi and send data to server, has around 700 - 800 mA peak current. Anyway, it is necessary to use such high capacity cap?

Hello, dont you have problem with fake bmp or bme sensors from china? They have different I2C adress and doesnt works proper. I buy one BMP and use library from here: http://giocarduino.altervista.org/e47-sensore-pres...It works on arduino pro mini, but not on esp8266. Pressure was wrong, when I try, even temperature was good. I think problem is in using char variables in esp.