Questions tagged [level]
The level tag has no usage guidance.
66
questions
2
votes
0answers
60 views
Strange levels on UART TX
I am trying to get the boot chatter from a UART on IOT device. When powered up TX line goes high as expected (3.3V), but when it starts "talking" - scope shows that hi/lo levels swings are ...
1
vote
3answers
67 views
Conceptual Question regarding necessity to do level shifting
I have a circuit where a 3.3V MCU which is not 5V compatible needs to drive an MCP23017. The MCP23017 will drive and read inputs and outputs from various 74HCT components. I'm thinking that based on ...
1
vote
2answers
103 views
How to control one motor with two float switches
I have 2 tanks , one is under another and hopes to pump from under tank to upper one using a 0.5 Hp single phase motor.By connecting float switches for both tank,can I control the motor to turn on ...
1
vote
1answer
122 views
Does the MPU9250 require a 5<->3V3 level shifter when used with Arduino Uno?
this is a quick question.
I'm building a flight tracker which uses several breakout boards. Most of which operate a 3V3, hence they require level shifters to be able to work with the Arduino without ...
0
votes
1answer
41 views
Audio line level conversion from consumer to unbalanced (presumably) pro 1/4" jack of unknown sensitivity and impedance. 400W 1980s PA amp
I have a lovely pair of speakers that achieve their almost flat response by dampening spikes.
Consequently they eat amp power for breakfast.
I have been given a 400W RMS per channel 19" rack mount ...
0
votes
1answer
43 views
Voltage level shifter using opamp
I am making a circuit to acquire EOG signals and read it via the analog pin of Arduino. The arduino reads only positive signals, which is why I am unable to see the negative spikes in voltages caused ...
1
vote
1answer
70 views
Need help in understanding the working of battery level indicator
I have got hold of a battery level indicator on net. I works but I am not able to understand how it is functioning.
I am new to electronics and I just dont want to build a circuit from a diagram. I ...
0
votes
3answers
76 views
Water level sensor. How to read it?
I have a water level sensor in which by varying the level of the water, an inductance change his value in a mobile coil. The sensor have the internal simple schematic like this (i don't know the value ...
2
votes
2answers
231 views
RS485 transceiver supplied with 3.3V. What voltages can I receive?
I'm designing a print for RS485 with the LTC2854 transceiver, but I don't know in what exact situation it will be placed in. So I don't know what voltage levels the other devices will communicate on. ...
0
votes
2answers
341 views
Colpitts / Clapp oscillator crystal drive level
simulate this circuit – Schematic created using CircuitLab
As I understand this circuit has some initial gain at startup, then as the oscillation builds up gain goes to unity at some moment. ...
0
votes
1answer
77 views
FT232R TTL Logic Levels
I have an FT232R chip hooked up to my oscilloscope with the TX and RX pins joined. I'm sending characters directly to it via Putty. The logic levels I am seeing are 5V low and 0V high. I thought the ...
2
votes
1answer
116 views
Why do we ground the common probe on a 3 probe liquid level sensor?
I have a liquid level sensor with 3 probes, one us common, the other is for low level and the third is for high level. On the liquid level control relay diagram, I've noticed that the common probe ...
-1
votes
1answer
73 views
Level Matching Circuit
Somebody know what do this circuit exactly or how it works ?
Where VDD = 5V (MCU) and VDD_1V8 = 1V8
It is a recommended circuit to use uart communication when the voltage level are not the same, I ...
3
votes
2answers
1k views
What is the common name for this seal-in relay?
I'm trying to build a hysteresis water pump system with 2 water level switches. Please see the diagram and explanation of this setup I've taken off the web:
The first switch (L) is set at the minimum ...
0
votes
1answer
271 views
How to make a battery level indicator for arduino (The battery is powering the arduino also) [duplicate]
Hi I am building a pocket altitude, temperature and humidity meter with 1.8" TFT display. I have a 1000mah 3.3v Li-ion battery to power the whole system. I also need to display the battery level in ...
1
vote
3answers
242 views
Sensor For Continuous Water Level Measurement
I am designing water level controller for water tank and want to show the water level in LED bar Graph
I know how to transmit data to MCU and show level to LED bar graph but my problem is to find ...
0
votes
2answers
147 views
4-Channel Level Converter outputs voltage when it shouldn't?
I am converting 5V to 3.3V (for a rudimentary Raspberry Pi project). The level converter scenario below behaves as I would expect:
Because HV1 is connected to 5V, the voltmeter connected to LV1 and ...
1
vote
1answer
386 views
PCM5102A: analog output level not what I expected?
I cannot achieve a 2.1 Vrms mentioned in their datasheet (pages 4 and 9). I can only output 1.04Vrms from the 1kHz source. Do I measure it wrong or this is what I should expect? Or maybe I get such ...
1
vote
2answers
493 views
Tank Water Level Indicator Wire
I am building a simple water level indicator (approx like the circuit below) for my tank.
However, I am wondering about the wiring, for I suppose copper cables corrode in water and produce toxic ...
3
votes
1answer
93 views
Point Water Level sensor
The company I work for uses conductive point-level water sensors to determine water level in a small tank. The manufacturer of these sensors has proven to have very unreliable quality control and ~30% ...
0
votes
1answer
46 views
Automatic level shifting
I have a signal which can have a different offset voltage based on the requirements. However, I need the voltage to start at zero.
Since the offset is variable, I was hoping if there are any ...
0
votes
0answers
41 views
Is using a capacitor to transfer a 0.1 V differential between voltage levels reasonable?
The temperature of a terminal at -600 V and 500 deg C needs to be measured. I am using a thermocouple for this, and to achieve the most accurate reading the couple must be physically connected to the -...
1
vote
2answers
82 views
sn74lvc1t45 pullup on the DIR line
The part sn74lvc1t45 we are sing as an SPI translator.
We usually use B -> A which means DIR goes to ground, however in a new design we are reversing this, and as a result, as per the DS it (being ...
2
votes
1answer
463 views
Can anybody help me modifying a reverb circuit on a guitar amp to an FX loop circuit?
I have a solid state guitar amplifier with a reverb tank. I have done a bit of research as to how these work. I now want to replace the reverb tank with an FX loop for normal pedals (instrument level)....
1
vote
1answer
208 views
How does this circuit works ? Usart level shift
I'd like to ask how does this circuit works:
I understand how it works in principle, but not technically. It's a USART voltage level shifter. It's supposed to divide 5V to 3.3V by a resistor divider, ...
5
votes
4answers
794 views
Will this water level indicator circuit work for my project?
I have only rudimentary knowledge of electronics so I ask for your forbearance.
There are many water level indicator circuits, of the type shown below, listed online and demonstrated on YouTube.
The ...
1
vote
2answers
598 views
Selecting a logic level MOSFET compatible with 3.7V power source
Continuation of prior question: Logic level mosfet to switch on 3.7v battery
I am a 'mature' entrepeneur Arduino level electronics noob, apologies. Want to build a flashing alert using 3W LEDs in ...
2
votes
0answers
66 views
Need a simple buzzer/LED circuit for espresso machine [duplicate]
I have an espresso machine that I tore down, reassembled with fewer components then modified it to fit a specific setup -- kind of DIY project.
The machine has an autofill circuit. After I removed ...
1
vote
0answers
418 views
RS-232 Level Shifter
Most PCs don't have RS232 built-in anymore. So the only option is USB-2-RS232 adapters or RS232 PCI-E card. While I expected the adapters to output a low voltage it turns out most RS232 PCI-E card ...
0
votes
1answer
107 views
Level Conversion RGB LED Strip Noise Resistor (3.3 to 5)
I recently prototyped my circuit on a breadboard that controls a WS2812b RGB LED Strip.
The PDIP (breadboard friendly) ATMEGA644 uses 5V logic while TQFP uses 3.3V logic.
The LED strip specifies a ...
1
vote
1answer
1k views
Water level indicator with PNP transistor
I wanted to create a circuit that Lit's up an LED when water level rises to a certain level.
I have created the following schematics following the https://www.electronicshub.org/water-level-alarm-...
0
votes
1answer
468 views
Capacitor in RS232 level shifter. Data is strictly half-duplex
I have created a level shifter very similar to the schematic at: http://picprojects.org.uk/projects/simpleSIO/ssio.htm except for the capacitor I use 47nF because the page claims:
at high bit rates ...
0
votes
2answers
91 views
I2C Level Converter
I have an Intel Edison communicating with a Olimexino-85S by i2c. The Intel Edison works with 1.8V levels while Olimexino does it whit 5V levels. I am using a Level Converter with pull-up resistors in ...
1
vote
0answers
241 views
CP2108 with level converter txb0108 - UART communication TTL and LVTTL
My project uses four different modems (one 3v3 LVTTL(?) and three 5v TTL) for AT communication.
Each modem has a UART interface (TTL compatible).
For my application, i chose the CP2108 to ...
2
votes
2answers
2k views
Negative level shifter
I need to connect two circuits that use different PSU voltages.
The first is a microcontroller clock generator, it outputs a clock 0V to 3.3V at 150KHz as maximum freq.
I need to connect this clock ...
0
votes
0answers
3k views
Basic insulation level for a 22 kV system
In the lab we tested a surge arrestor bracket for a 22 kV system with a 1.2/50 impulse. It was found that U10 for the bracket is 102 kV. I found this table for IEC standard of a 22 kV system
I read ...
2
votes
2answers
1k views
Level shifter to convert dc voltage
Can anyone help me to design a circuit which outputs 0v dc when the input is 2.6v dc and 5v dc when the input is 5v dc?
0
votes
1answer
2k views
transistor negative edge-triggered detector
This is a circuit I whipped up for an attempt to make a negative-edge triggered detector with inverted output.
The logic needs to be the following:
If input is high, output is high.
If input goes ...
0
votes
1answer
758 views
turn level-based input to edge-triggered input [duplicate]
I'm trying to figure out with the most minimal part count how to convert an input of a digital IC to an edge-triggered input.
I am using the 82C55 IC and the input on it I want to make negative edge-...
0
votes
1answer
120 views
can contactor, water level sensor and heater all live in parallel on the same circuit
I want to connect my 3000w (220v) water heating element to a 220v water level sensor Automático de Nível so that the heating element won't turn on when there is no water present.
But the level sensor ...
1
vote
1answer
63 views
Continous liquid level measurement loop connection device
I have 4-20mA loop device for measuring liquid levels. It was working well until I connected a motor (heavy load) to the same outlet(120Vac). I have this device ON and as soon as motor turns ON the ...
1
vote
1answer
155 views
Voltage difference between two individual voltage sources
I have two voltage sources. The first one is 230VAC to 5VDC cell phone battery charger while the another is output from Raspberry Pi's Ground and 3V3 pins.
I feed the 5VDC output for an Arduino. What ...
2
votes
1answer
2k views
Calculating SPL from voltage output of a microphone with MAX4466 amplifier
I'm using Electret Microphone Amplifier - MAX4466 with Adjustable Gain and I'm getting the output voltage ranging from 1.5V to 3V (which, to my knowledge, is already amplified by MAX4466). I know that ...
0
votes
2answers
963 views
Convert TTL levels to RS232 of FTDI USB<->Serial
Have this small interface FTDI FT232RL to connect a Serial device to the computer via USB.
It has been working well for most of my Serial applications, except today when I tried to use it for a ...
1
vote
1answer
2k views
Logic level P-channel Mosfet switch
I need to switch a load with a 3.3 volts logic level (pic microcontroller) is this design is correct?
1
vote
1answer
1k views
How to Shift the DC Level of Positive-going Op Amp Input Signal into the Negative Supply Region
I have a 1Vpp 1Hz repetitive arbitrary wave signal that resides entirely above the DC line. IOW there is no negative-going excursion. This is output from an LM358 inverting op amp buffer powered ...
0
votes
1answer
374 views
Logic Level Conversion. Different Voltages on High Side
I've used this circuit before to do logic level conversion. The diagram is labeled to reflect I2C however I am using it for UART.
Usually my scenarios have been where the low side is 3.3v and the ...
2
votes
5answers
27k views
how to convert UART voltage from 5v to 3.3v? [duplicate]
I have PIC18F4455 connected to spark core wifi chip. I send data from PIC18F4455 to the spark core by using UART. The problem is the output data of pic18f4455 equals to 5v, and the spark core accepts ...
0
votes
2answers
49 views
Level Adjustment Component
I am developing simple project of water level alert when water reaches to a certain level (adjusted by user) in inches.
Which electronic component i should use where user can adjust inches?
Like 5, ...
1
vote
1answer
2k views
liquid level switch and solenoid valve circuit
I am trying to make sure that I have this circuit hooked up right before I actually put it to use. I’m planning to use the liquid level switch (McMaster PN:50195K93) to open the solenoid valve (...
