I am hoping that I could get some help. I have been using the XL6009 buck-boost module in order to step down the 3.7v from a Lipo battery to 3v. This has been working fine in the past however the last two boards I used increased the voltage but would not decrease lower than 10V. I then tried the XL4015 to just step down the voltage. I connected the module to a 3.7 V lipo battery and I can read the 3.6 volt on the connectors labeled out + and -, however, nothing happens when I turn the little screw on the module? Please put me out of my misery and tell me what I am doing wrong ? I will be so grateful. I am new to electronics and might be making many many silly mistakes.
You need to have an input voltage greater than minimum. The datasheet I found said minimum 8 volt. You tell minimum 4 volt so a 3.7 volt cell won't work for that converter.
It depends on the manufacturer of the XL6009 IC. I have one data sheet that states 5V minimum and another states 3.6V. Whoever is making the PCB probably switched manufacturers, from the 3.6V one to to 5V
Thank you both so much for your reply. Yes, the datasheet for XL6009 I purchased did state that the input voltage should be 3.6V. I basically have a 3.7v lipo battery connected to a TP4056 USB charging unit. I need to work with 3v and 5v to power a sensor-enabled activity quilt for children. The sensors I am using are all drawing milliamps. The logic is handled by an Arduino Mega256. What is the best way to make use of the 3.7v battery to output 3v and 5v? 3v to power most of the sensors and 5v to power the Arduino and a recording module? I would really appreciate any advice. It is really important that the quilt is rechargeable since it will be deployed in South Africa in areas with unstable electricity supply. The below image is what I have so far. Thank you so much !
You only need ONE Boost regulator to go from 3.6V to 5V.
Connect the 5V to the Arduino Vin pin and whatever else uses 5V.
Use the Arduino 3.3V output to power your 3.3v sensors
Hi Again Jim -p, thank you for the advice, I have a lot of sensors, will the Arduino cope with the amperage of all the sensors ( around 30 ) ? Or is it perhaps fine to use 3.7 volts for the 3-volt sensors? Once again, thank you for your reply!
Sarina
That's a different story.
You need to add up the currents required by the 3.3V sensors. If it's more than 100mA then you will need a buck regulator to go from the 5V down to 3.3V
DO NOT connect a 3.7V battery to a 3.3V device.
Oh no... that was premature happiness, it needs 4v input
Would this work to get 3.7 to 5V Search
or this ? Mini DC-DC Boost Step Up Converter
Thank you so much for helping me jim-p. I am learning a lot, this is the last step to deploying my quilt and finishing my PhD fieldwork. I truly am eternally grateful !
We have big electronics suppliers in South Africa, I can probably get any product here if you can give me the name etc, and a link to it. I would be so very greatful!
Sarina
Why don't you use a cellphone powerbank.
That's a LiPo battery, a charger, and a 5volt boost converter all in one.
Can be directly connected to the Mega's USB socket.
The Mega has a dedicated 3.3volt/150mA regulator.
I think I see a touch sensor on the diagram. They run on fumes.
Leo..
Hi Wawa, thank you so much for your reply. I am building an IoT sensor enabled activity quilt for children to use . THis quilt has four panels with activities on them which include LED's LED strips, around 30-40 sensors (touch, tap, tilt, sound,) loads of conductive thread, and a few recording and playback units. I am afraid that the amperage might be too much for the Arduino's 3.3v supply (I am new to the electronics bit so I might be completely wrong). This is why I started this journey of trying to build an alternate power source. Will the Arduino board be able to provide enough amperage? I just once again want to thank everyone for their replies. It is greatly appreciated!
Sarina
I am using the following per quilt
TTP223 touch sensors - around 12 per quilt
LED strips and LEDs - 2 strips and a variety of LEDs (green, blue, red, and bright white)
Tap sensors: KE0025 / 181324 2-3 per quilt
Temperature sensor: KY-028
Heart rate sensor: KY0076 / 190008
Recording module: ISD1820 2/3 per quilt.
Tilt sensor: KY0002 / 180585
a big sound sensor: KY-037
All the sensors and LEDs are not powered up at the same time. The touch sensors light up LEDs when touched. The tilt sensor lights up LEDs.
I am not 100% sure how many sensors per quilt since each mom has her own design. This is the standard though.
Thank you!
I really am learning a lot and I am so grateful.
Sarina
