Tondaj SL-814 - Revision history

Leo: Added categories

2020-06-14T23:28:00Z

Added categories

← Older revision		Revision as of 23:28, 14 June 2020
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	==See Also==		==See Also==
			*https://sigrok.org/wiki/Tondaj_SL-814

	*https:~~//sigrok.org/wiki/Tondaj_SL-814~~		{{Navbox Tinkering}}[[Category:Tinkering]]

Leo: /* Troubleshooting */

2020-05-23T02:00:02Z

Troubleshooting

← Older revision		Revision as of 02:00, 23 May 2020
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	For some reason, the device sometimes shows abnormally high values in the range of 100dB while the true reading should be in the neighborhood of 50dB. This behavior occurs both on battery power and via the 9V power input.		For some reason, the device sometimes shows abnormally high values in the range of 100dB while the true reading should be in the neighborhood of 50dB. This behavior occurs both on battery power and via the 9V power input.

	The incorrect reading corrected itself after I accidentally tripped on the power cord causing the unit to drop and disconnect and then leaving it for a few minutes. The issue recurred again out of the blue while the unit was still powered on as visualized by the graph on the right.		The incorrect reading corrected itself after I accidentally tripped on the power cord causing the unit to drop and disconnect and then leaving it for a few minutes. The issue recurred again out of the blue while the unit was still powered on as visualized by the graph on the right. This was eventually 'fixed' by taking the back cover off and pressing on the back of the PCB until the readings got back to normal. Possibly bad soldering or something.

	==See Also==		==See Also==

	*https://sigrok.org/wiki/Tondaj_SL-814		*https://sigrok.org/wiki/Tondaj_SL-814

Leo: updated arduino code

2020-05-20T21:54:31Z

updated arduino code

← Older revision		Revision as of 21:54, 20 May 2020
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	[[File:Tondaj SL-814 with ESP8266.jpg\|alt=Tondaj SL-814 with ESP8266 polling data and pushing it via WiFi\|thumb\|Tondaj SL-814 with ESP8266 polling data and pushing it via WiFi]]		[[File:Tondaj SL-814 with ESP8266.jpg\|alt=Tondaj SL-814 with ESP8266 polling data and pushing it via WiFi\|thumb\|Tondaj SL-814 with ESP8266 polling data and pushing it via WiFi]]
	The Tondaj SL-814 is a sound level meter with a USB port. I bought this from Deal Extreme back in December 2012 for $12.55 USD when they had the 50% off sale.		The Tondaj SL-814 is a sound level meter with a 'USB' port. This unit is not an actual USB device despite the USB device icon printed on the side. I bought this from Deal Extreme back in December 2012 for $12.55 USD when they had the 50% off sale.

	The product is also called a "7-Range Sound and Noise Meter-3085".		The product is also called a "7-Range Sound and Noise Meter-3085".
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	I was able to hook up an ESP8266 to the serial via USB and poll the decibel value. The value is then broadcast via MQTT which NodeRed processes and dumps into InfluxDB as a measurement.		I was able to hook up an ESP8266 to the serial via USB and poll the decibel value. The value is then broadcast via MQTT which NodeRed processes and dumps into InfluxDB as a measurement.

	The Arduino sketch used the same protocol as the code above~~. I'm not certain if a delay is required after the query is sent, but I added a 200ms delay just in case~~.		The Arduino sketch used the same protocol as the code above.
	{{highlight\|lang=c\|code=		{{highlight\|lang=c\|code=

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	void process_data() {		void process_data() {
	~~digitalWrite(LED_BUILTIN, LOW);~~

	// write query		// write query
	Serial.write(0x30);		Serial.write(0x30);
	Serial.write(0x01);		Serial.write(0x01);
	Serial.write(0x0d);		Serial.write(0x0d);

	~~delay(200);~~
	~~digitalWrite(LED_BUILTIN, HIGH);~~

	// read 4 bytes.		// read 4 bytes.
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	// got no data after timeout, do nothing.		// got no data after timeout, do nothing.
	if (a == -1 {{!}}{{!}} b == -1) return;		if (a == -1 {{!}}{{!}} b == -1) {
			// try to reset the connection in case it thinks we sent
			// an invalid command.
			Serial.write(0x0d);
			while (Serial.available() > 0) Serial.read();

			// initialize
			Serial.write(0x10);
			Serial.write(0x04);
			Serial.write(0x0d);
			delay(100);
			while (Serial.available() > 0) Serial.read();
			return;
			}

	// level value is found across 11 bits.		// level value is found across 11 bits.

Leo: /* Troubleshooting */ Added graph and more information on abnormal readings.

2020-05-20T21:49:38Z

Troubleshooting: Added graph and more information on abnormal readings.

← Older revision		Revision as of 21:49, 20 May 2020
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	}}		}}

	=== Troubleshooting ===		===Troubleshooting===

	==== Sound measurements are inaccurate ====		====Sound measurements are inaccurate====
	For some reason, the device sometimes shows abnormally high values~~. This occurred after I plugged~~ in ~~a wall adapter which had~~ the ~~wrong polarity to~~ the ~~9V input. After correcting~~ the ~~polarity, the unit consistently showed 100dB when it was really around 40dB~~. ~~It did this while~~ on battery power ~~as well~~. The incorrect reading corrected itself after I accidentally tripped on the power cord causing the unit to drop and disconnect and then leaving it for a few minutes. ~~To fix~~ the ~~bad readings, perhaps try disconnecting power from~~ the unit ~~and leaving it alone. I suspect perhaps something internally needs to drain~~.		[[File:Tondaj Sl-814 Sound Abnormality.png\|alt=Tondaj Sl-814 sound meter readings become in accurate.\|thumb\|Tondaj Sl-814 sound meter readings become in accurate.]]
			For some reason, the device sometimes shows abnormally high values in the range of 100dB while the true reading should be in the neighborhood of 50dB. This behavior occurs both on battery power and via the 9V power input.

			The incorrect reading corrected itself after I accidentally tripped on the power cord causing the unit to drop and disconnect and then leaving it for a few minutes. The issue recurred again out of the blue while the unit was still powered on as visualized by the graph on the right.

	==See Also==		==See Also==

	*https://sigrok.org/wiki/Tondaj_SL-814		*https://sigrok.org/wiki/Tondaj_SL-814

Leo: troubleshooting bad readings

2020-05-19T04:39:28Z

troubleshooting bad readings

← Older revision		Revision as of 04:39, 19 May 2020
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	mqtt_push_value(level);		mqtt_push_value(level);
	}		<nowiki>}</nowiki>
	}}		}}

			=== Troubleshooting ===

			==== Sound measurements are inaccurate ====
			For some reason, the device sometimes shows abnormally high values. This occurred after I plugged in a wall adapter which had the wrong polarity to the 9V input. After correcting the polarity, the unit consistently showed 100dB when it was really around 40dB. It did this while on battery power as well. The incorrect reading corrected itself after I accidentally tripped on the power cord causing the unit to drop and disconnect and then leaving it for a few minutes. To fix the bad readings, perhaps try disconnecting power from the unit and leaving it alone. I suspect perhaps something internally needs to drain.

	==See Also==		==See Also==

	*https://sigrok.org/wiki/Tondaj_SL-814		*https://sigrok.org/wiki/Tondaj_SL-814

Leo: /* ESP8266 Integration */

2020-05-19T04:32:50Z

ESP8266 Integration

← Older revision		Revision as of 04:32, 19 May 2020
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	// got no data after timeout, do nothing.		// got no data after timeout, do nothing.
	if (a == -1 \|\| b == -1) return;		if (a == -1 {{!}}{{!}} b == -1) return;

	// level value is found across 11 bits.		// level value is found across 11 bits.
	int level = ((a & 0x07) << 8) \| (b & 0xff);		int level = ((a & 0x07) << 8) {{!}} (b & 0xff);

	mqtt_push_value(level);		mqtt_push_value(level);

Leo: /* USB Connection */ Added images

2020-05-19T04:31:37Z

USB Connection: Added images

← Older revision		Revision as of 04:31, 19 May 2020
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			[[File:Tondaj SL-814 with ESP8266.jpg\|alt=Tondaj SL-814 with ESP8266 polling data and pushing it via WiFi\|thumb\|Tondaj SL-814 with ESP8266 polling data and pushing it via WiFi]]
	The Tondaj SL-814 is a sound level meter with a USB port. I bought this from Deal Extreme back in December 2012 for $12.55 USD when they had the 50% off sale.		The Tondaj SL-814 is a sound level meter with a USB port. I bought this from Deal Extreme back in December 2012 for $12.55 USD when they had the 50% off sale.

	The product is also called a "7-Range Sound and Noise Meter-3085".		The product is also called a "7-Range Sound and Noise Meter-3085".

	== USB Connection ==		==USB Connection==
	The meter has an optional USB cable that can be purchased and used with their proprietary software. However the meter I bought did not come with such a cable. Using an ordinary USB mini cable does not work since the device doesn't show up as a proper USB device when connected. On further research, it appears that the USB port is used to expose the internal serial connection to the microcontroller which can be interfaced with using any TTL UART adapter or module.		The meter has an optional USB cable that can be purchased and used with their proprietary software. However the meter I bought did not come with such a cable. Using an ordinary USB mini cable does not work since the device doesn't show up as a proper USB device when connected. On further research, it appears that the USB port is used to expose the internal serial connection to the microcontroller which can be interfaced with using any TTL UART adapter or module.

	[[File:SL-814 Pinout.jpg\|thumb\|center]]		[[File:SL-814 Pinout.jpg\|thumb\|center\|alt=SL-814 USB Pinout\|SL-814 USB Pinout]]

	The pinouts from the USB port on this device are listed in the table below. Serial is only enabled when the USBOTGID pin is grounded; if you decide to splice a USB mini cable and it doesn't expose 5 wires, you will need to short the USBOTGID pin to ground inside the meter.		The pinouts from the USB port on this device are listed in the table below. Serial is only enabled when the USBOTGID pin is grounded; if you decide to splice a USB mini cable and it doesn't expose 5 wires, you will need to short the USBOTGID pin to ground inside the meter.
Line 12:		Line 13:
	USB Mini Pinout:		USB Mini Pinout:
	{\| class="wikitable"		{\| class="wikitable"
	! Pin		!Pin
	! Connection		!Connection
	! Description		!Description
	\|-		\|-
	\| 1		\|1
	\| 5V		\|5V
	\| Leave disconnected. 5V power supplied by sound meter battery.		\|Leave disconnected. 5V power supplied by sound meter battery.
	\|-		\|-
	\| 2		\|2
	\| Serial Rx		\|Serial Rx
	\| Connect to Tx on UART module		\|Connect to Tx on UART module
	\|-		\|-
	\| 3		\|3
	\| Serial Tx		\|Serial Tx
	\| Connect to Rx on UART module		\|Connect to Rx on UART module
	\|-		\|-
	\| 4		\|4
	\| USBOTGID		\|USBOTGID
	\| Short to ground		\|Short to ground
	\|-		\|-
	\| 5		\|5
	\| Ground		\|Ground
	\| Connect to Gnd on UART module		\|Connect to Gnd on UART module
	\|}		\|}

	== Protocol ==		==Protocol==
	Communication on the serial line is done at 9600 baud with 8e1 setting (8 data bit, even parity, 1 stop bit). The page at https://sigrok.org/wiki/Tondaj_SL-814 has the specifics on the protocol.		Communication on the serial line is done at 9600 baud with 8e1 setting (8 data bit, even parity, 1 stop bit). The page at https://sigrok.org/wiki/Tondaj_SL-814 has the specifics on the protocol.

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	== ESP8266 Integration ==		==ESP8266 Integration==
	I was able to hook up an ESP8266 to the serial via USB and poll the decibel value. The value is then broadcast via MQTT which NodeRed processes and dumps into InfluxDB as a measurement.		I was able to hook up an ESP8266 to the serial via USB and poll the decibel value. The value is then broadcast via MQTT which NodeRed processes and dumps into InfluxDB as a measurement.

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	}}		}}

	== See Also ==		==See Also==
	* https://sigrok.org/wiki/Tondaj_SL-814
			*https://sigrok.org/wiki/Tondaj_SL-814

Leo at 04:26, 19 May 2020

2020-05-19T04:26:45Z

@@ Line 82: / Line 82: @@
 }}
 == See Also ==
 * https://sigrok.org/wiki/Tondaj_SL-814

Leo: Created page with "The Tondaj SL-814 is a sound level meter with a USB port. I bought this from Deal Extreme back in December 2012 for $12.55 USD when they had the 50% off sale. The product is..."

2020-05-17T06:16:22Z

Created page with "The Tondaj SL-814 is a sound level meter with a USB port. I bought this from Deal Extreme back in December 2012 for $12.55 USD when they had the 50% off sale. The product is..."

New page

The Tondaj SL-814 is a sound level meter with a USB port. I bought this from Deal Extreme back in December 2012 for $12.55 USD when they had the 50% off sale.

The product is also called a "7-Range Sound and Noise Meter-3085".

== USB Connection ==
The meter has an optional USB cable that can be purchased and used with their proprietary software. However the meter I bought did not come with such a cable. Using an ordinary USB mini cable does not work since the device doesn't show up as a proper USB device when connected. On further research, it appears that the USB port is used to expose the internal serial connection to the microcontroller which can be interfaced with using any TTL UART adapter or module.

[[File:SL-814 Pinout.jpg|thumb|center]]

The pinouts from the USB port on this device are listed in the table below. Serial is only enabled when the USBOTGID pin is grounded; if you decide to splice a USB mini cable and it doesn't expose 5 wires, you will need to short the USBOTGID pin to ground inside the meter.

USB Mini Pinout:
{| class="wikitable"
! Pin
! Connection
! Description
|-
| 1
| 5V
| Leave disconnected. 5V power supplied by sound meter battery.
|-
| 2
| Serial Rx
| Connect to Tx on UART module
|-
| 3
| Serial Tx
| Connect to Rx on UART module
|-
| 4
| USBOTGID
| Short to ground
|-
| 5
| Ground
| Connect to Gnd on UART module
|}

== Protocol ==
Communication on the serial line is done at 9600 baud with 8e1 setting (8 data bit, even parity, 1 stop bit). The page at https://sigrok.org/wiki/Tondaj_SL-814 has the specifics on the protocol.

The following python script will poll the meter every half second:

{{highlight|lang=python|code=
#!/usr/bin/python3
# Tondaj SL-814 sound level meter Python script
# Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
# Released under the terms of the GNU GPL, version 2 or later.

import time
import serial

s = serial.Serial('/dev/ttyUSB0', baudrate=9600, parity=serial.PARITY_EVEN)

while 1:
# Query
s.write(bytes([0x30, 0x01, 0x0d]))
result = s.read(4)
print('%02x %02x %02x %02x' % tuple(result), end=' - ')

# A/C
ac = (result[0] & (1 << 7)) >> 7
print('A' if ac == 0 else 'C', end=', ')

# Slow/Fast
sl = (result[0] & (1 << 3)) >> 3
print('Fast' if sl == 0 else 'Slow', end=', ')

# Level
factor = (result[0] & ((1 << 5) {{!}} (1 << 4))) >> 4
print('Level: %d' % (40 + (int(bin(factor), 2) * 20)), end=', ')

# Value
val = ((result[0] & 0x7) << 8) {{!}} result[1]
tmp_str = '%d' % val
val_str = tmp_str[:-1] + '.' + tmp_str[-1:]
print(val_str + ' dB')

time.sleep(0.5)

s.close()
}}

== See Also ==
* https://sigrok.org/wiki/Tondaj_SL-814